---
_id: '17678'
abstract:
- lang: eng
text: 'The spectra of several high-redshift (z>6) quasars have shown evidence for
a Gunn-Peterson (GP) damping wing, indicating a substantial mean neutral hydrogen
fraction (x_HI > 0.03) in the z ~ 6 intergalactic medium (IGM). However, previous
analyses assumed that the IGM was uniformly ionized outside of the quasar''s HII
region. Here we relax this assumption and model patchy reionization scenarios
for a range of IGM and quasar parameters. We quantify the impact of these differences
on the inferred x_HI, by fitting the spectra of three quasars: SDSS J1148+5251
(z=6.419), J1030+0524 (z=6.308), and J1623+3112 (z=6.247). We find that the best-fit
values of x_HI in the patchy models agree well with the uniform case. More importantly,
we confirm that the observed spectra favor the presence of a GP damping wing,
with peak likelihoods decreasing by factors of > few - 10 when the spectra are
modeled without a damping wing. We also find that the Ly alpha absorption spectra,
by themselves, cannot distinguish the damping wing in a relatively neutral IGM
from a damping wing in a highly ionized IGM, caused either by an isolated neutral
patch, or by a damped Ly alpha absorber (DLA). However, neutral patches in a highly
ionized universe (x_HI < 0.01), and DLAs with the large required column densities
(N_HI > few x 10^{20} cm^{-2}) are both rare. As a result, when we include reasonable
prior probabilities for the line of sight (LOS) to intercept either a neutral
patch or a DLA at the required distance of ~ 40-60 comoving Mpc away from the
quasar, we find strong lower limits on the neutral fraction in the IGM, x_HI >
0.1 (at 95% confidence). This strengthens earlier claims that a substantial global
fraction of hydrogen in the z~6 IGM is in neutral form.'
article_processing_charge: No
article_type: original
author:
- first_name: Joshua
full_name: Schroeder, Joshua
last_name: Schroeder
- first_name: Andrei
full_name: Mesinger, Andrei
last_name: Mesinger
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
citation:
ama: 'Schroeder J, Mesinger A, Haiman Z. Evidence of Gunn–Peterson damping wings
in high-z quasar spectra: Strengthening the case for incomplete reionization at
z ∼ 6–7. Monthly Notices of the Royal Astronomical Society. 2012;428(4):3058-3071.
doi:10.1093/mnras/sts253'
apa: 'Schroeder, J., Mesinger, A., & Haiman, Z. (2012). Evidence of Gunn–Peterson
damping wings in high-z quasar spectra: Strengthening the case for incomplete
reionization at z ∼ 6–7. Monthly Notices of the Royal Astronomical Society.
Oxford University Press. https://doi.org/10.1093/mnras/sts253'
chicago: 'Schroeder, Joshua, Andrei Mesinger, and Zoltán Haiman. “Evidence of Gunn–Peterson
Damping Wings in High-z Quasar Spectra: Strengthening the Case for Incomplete
Reionization at z ∼ 6–7.” Monthly Notices of the Royal Astronomical Society.
Oxford University Press, 2012. https://doi.org/10.1093/mnras/sts253.'
ieee: 'J. Schroeder, A. Mesinger, and Z. Haiman, “Evidence of Gunn–Peterson damping
wings in high-z quasar spectra: Strengthening the case for incomplete reionization
at z ∼ 6–7,” Monthly Notices of the Royal Astronomical Society, vol. 428,
no. 4. Oxford University Press, pp. 3058–3071, 2012.'
ista: 'Schroeder J, Mesinger A, Haiman Z. 2012. Evidence of Gunn–Peterson damping
wings in high-z quasar spectra: Strengthening the case for incomplete reionization
at z ∼ 6–7. Monthly Notices of the Royal Astronomical Society. 428(4), 3058–3071.'
mla: 'Schroeder, Joshua, et al. “Evidence of Gunn–Peterson Damping Wings in High-z
Quasar Spectra: Strengthening the Case for Incomplete Reionization at z ∼ 6–7.”
Monthly Notices of the Royal Astronomical Society, vol. 428, no. 4, Oxford
University Press, 2012, pp. 3058–71, doi:10.1093/mnras/sts253.'
short: J. Schroeder, A. Mesinger, Z. Haiman, Monthly Notices of the Royal Astronomical
Society 428 (2012) 3058–3071.
date_created: 2024-09-06T08:04:35Z
date_published: 2012-11-22T00:00:00Z
date_updated: 2024-09-25T08:53:21Z
day: '22'
doi: 10.1093/mnras/sts253
extern: '1'
intvolume: ' 428'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1093/mnras/sts253
month: '11'
oa: 1
oa_version: Published Version
page: 3058-3071
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
issn:
- 0035-8711
- 1365-2966
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Evidence of Gunn–Peterson damping wings in high-z quasar spectra: Strengthening
the case for incomplete reionization at z ∼ 6–7'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 428
year: '2012'
...
---
_id: '17688'
abstract:
- lang: eng
text: Pulsar timing arrays (PTAs) are expected to detect gravitational waves (GWs)
from individual low-redshift (z<1.5) compact supermassive (M>10^9 Msun) black
hole (SMBH) binaries with orbital periods of approx. 0.1 - 10 yrs. Identifying
the electromagnetic (EM) counterparts of these sources would provide confirmation
of putative direct detections of GWs, present a rare opportunity to study the
environments of compact SMBH binaries, and could enable the use of these sources
as standard sirens for cosmology. Here we consider the feasibility of such an
EM identification. We show that because the host galaxies of resolved PTA sources
are expected to be exceptionally massive and rare, it should be possible to find
unique hosts of resolved sources out to redshift z=0.2. At higher redshifts, the
PTA error boxes are larger, and may contain as many as 100 massive-galaxy interlopers.
The number of candidates, however, remains tractable for follow-up searches in
upcoming wide-field EM surveys. We develop a toy model to characterize the dynamics
and the thermal emission from a geometrically thin, gaseous disc accreting onto
a PTA-source SMBH binary. Our model predicts that at optical and infrared frequencies,
the source should appear similar to a typical luminous active galactic nucleus
(AGN). However, owing to the evacuation of the accretion flow by the binary's
tidal torques, the source might have an unusually low soft X-ray luminosity and
weak UV and broad optical emission lines, as compared to an AGN powered by a single
SMBH with the same total mass. For sources near z=1, the decrement in the rest-frame
UV should be observable as an extremely red optical color. These properties would
make the PTA sources stand out among optically luminous AGN, and could allow their
unique identification.
alternative_title:
- Electromagnetic counterparts of PTA sources
article_processing_charge: No
article_type: original
author:
- first_name: Takamitsu
full_name: Tanaka, Takamitsu
last_name: Tanaka
- first_name: Kristen
full_name: Menou, Kristen
last_name: Menou
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
citation:
ama: Tanaka T, Menou K, Haiman Z. Electromagnetic counterparts of supermassive black
hole binaries resolved by pulsar timing arrays. Monthly Notices of the Royal
Astronomical Society. 2012;420(1):705-719. doi:10.1111/j.1365-2966.2011.20083.x
apa: Tanaka, T., Menou, K., & Haiman, Z. (2012). Electromagnetic counterparts
of supermassive black hole binaries resolved by pulsar timing arrays. Monthly
Notices of the Royal Astronomical Society. Oxford University Press. https://doi.org/10.1111/j.1365-2966.2011.20083.x
chicago: Tanaka, Takamitsu, Kristen Menou, and Zoltán Haiman. “Electromagnetic Counterparts
of Supermassive Black Hole Binaries Resolved by Pulsar Timing Arrays.” Monthly
Notices of the Royal Astronomical Society. Oxford University Press, 2012.
https://doi.org/10.1111/j.1365-2966.2011.20083.x.
ieee: T. Tanaka, K. Menou, and Z. Haiman, “Electromagnetic counterparts of supermassive
black hole binaries resolved by pulsar timing arrays,” Monthly Notices of the
Royal Astronomical Society, vol. 420, no. 1. Oxford University Press, pp.
705–719, 2012.
ista: Tanaka T, Menou K, Haiman Z. 2012. Electromagnetic counterparts of supermassive
black hole binaries resolved by pulsar timing arrays. Monthly Notices of the Royal
Astronomical Society. 420(1), 705–719.
mla: Tanaka, Takamitsu, et al. “Electromagnetic Counterparts of Supermassive Black
Hole Binaries Resolved by Pulsar Timing Arrays.” Monthly Notices of the Royal
Astronomical Society, vol. 420, no. 1, Oxford University Press, 2012, pp.
705–19, doi:10.1111/j.1365-2966.2011.20083.x.
short: T. Tanaka, K. Menou, Z. Haiman, Monthly Notices of the Royal Astronomical
Society 420 (2012) 705–719.
date_created: 2024-09-06T08:23:06Z
date_published: 2012-01-23T00:00:00Z
date_updated: 2024-09-25T09:49:01Z
day: '23'
doi: 10.1111/j.1365-2966.2011.20083.x
extern: '1'
intvolume: ' 420'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1111/j.1365-2966.2011.20083.x
month: '01'
oa: 1
oa_version: Published Version
page: 705-719
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Electromagnetic counterparts of supermassive black hole binaries resolved by
pulsar timing arrays
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 420
year: '2012'
...
---
_id: '17705'
abstract:
- lang: eng
text: Observations of high-redshift quasars at z>6 imply that supermassive black
holes (SMBHs) with masses over a billion solar masses were in place less than
1 Gyr after the Big Bang. If these SMBHs assembled from "seed" BHs left behind
by the first stars, then they must have accreted gas at close to the Eddington
limit during a large fraction (>50%) of the time. A generic problem with this
scenario, however, is that the mass density in million-solar-mass SMBHs at z=6
already exceeds the locally observed SMBH mass density by several orders of magnitude;
in order to avoid this overproduction, BH seed formation and growth must become
significantly less efficient in less massive protogalaxies, while proceeding uninterrupted
in the most massive galaxies that formed first. Using Monte-Carlo realizations
of the merger and growth history of BHs, we show that X-rays from the earliest
accreting BHs can provide such a feedback mechanism. Our calculations paint a
self-consistent picture of black-hole-made climate change, in which the first
miniquasars---among them the ancestors of the z>6 quasar SMBHs---globally warm
the IGM and suppress the formation and growth of subsequent generations of BHs.
We present two specific models with global miniquasar feedback that provide excellent
agreement with recent estimates of the z=6 SMBH mass function. For each of these
models, we estimate the rate of BH mergers at z>6 that could be detected by the
proposed gravitational-wave observatory eLISA/NGO.
alternative_title:
- IGM global warming by high-redshift miniquasars
article_processing_charge: No
article_type: original
author:
- first_name: Takamitsu
full_name: Tanaka, Takamitsu
last_name: Tanaka
- first_name: Rosalba
full_name: Perna, Rosalba
last_name: Perna
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
citation:
ama: 'Tanaka T, Perna R, Haiman Z. X-ray emission from high-redshift miniquasars:
Self-regulating the population of massive black holes through global warming.
Monthly Notices of the Royal Astronomical Society. 2012;425(4):2974-2987.
doi:10.1111/j.1365-2966.2012.21539.x'
apa: 'Tanaka, T., Perna, R., & Haiman, Z. (2012). X-ray emission from high-redshift
miniquasars: Self-regulating the population of massive black holes through global
warming. Monthly Notices of the Royal Astronomical Society. Oxford University
Press. https://doi.org/10.1111/j.1365-2966.2012.21539.x'
chicago: 'Tanaka, Takamitsu, Rosalba Perna, and Zoltán Haiman. “X-Ray Emission from
High-Redshift Miniquasars: Self-Regulating the Population of Massive Black Holes
through Global Warming.” Monthly Notices of the Royal Astronomical Society.
Oxford University Press, 2012. https://doi.org/10.1111/j.1365-2966.2012.21539.x.'
ieee: 'T. Tanaka, R. Perna, and Z. Haiman, “X-ray emission from high-redshift miniquasars:
Self-regulating the population of massive black holes through global warming,”
Monthly Notices of the Royal Astronomical Society, vol. 425, no. 4. Oxford
University Press, pp. 2974–2987, 2012.'
ista: 'Tanaka T, Perna R, Haiman Z. 2012. X-ray emission from high-redshift miniquasars:
Self-regulating the population of massive black holes through global warming.
Monthly Notices of the Royal Astronomical Society. 425(4), 2974–2987.'
mla: 'Tanaka, Takamitsu, et al. “X-Ray Emission from High-Redshift Miniquasars:
Self-Regulating the Population of Massive Black Holes through Global Warming.”
Monthly Notices of the Royal Astronomical Society, vol. 425, no. 4, Oxford
University Press, 2012, pp. 2974–87, doi:10.1111/j.1365-2966.2012.21539.x.'
short: T. Tanaka, R. Perna, Z. Haiman, Monthly Notices of the Royal Astronomical
Society 425 (2012) 2974–2987.
date_created: 2024-09-06T08:50:56Z
date_published: 2012-10-01T00:00:00Z
date_updated: 2024-09-25T11:40:30Z
day: '01'
doi: 10.1111/j.1365-2966.2012.21539.x
extern: '1'
intvolume: ' 425'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1111/j.1365-2966.2012.21539.x
month: '10'
oa: 1
oa_version: Published Version
page: 2974-2987
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'X-ray emission from high-redshift miniquasars: Self-regulating the population
of massive black holes through global warming'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 425
year: '2012'
...
---
_id: '1782'
abstract:
- lang: eng
text: Steering a quantum harmonic oscillator state along cyclic trajectories leads
to a path-dependent geometric phase. Here we describe its experimental observation
in an electronic harmonic oscillator. We use a superconducting qubit as a nonlinear
probe of the phase, which is otherwise unobservable due to the linearity of the
oscillator. We show that the geometric phase is, for a variety of cyclic paths,
proportional to the area enclosed in the quadrature plane. At the transition to
the nonadiabatic regime, we study corrections to the phase and dephasing of the
qubit caused by qubit-resonator entanglement. In particular, we identify parameters
for which this dephasing mechanism is negligible even in the nonadiabatic regime.
The demonstrated controllability makes our system a versatile tool to study geometric
phases in open quantum systems and to investigate their potential for quantum
information processing.
acknowledgement: This work is supported by the EU project GEOMDISS, the Austrian Science
Foundation (S. F.), and the Swiss National Science Foundation (SNSF)
author:
- first_name: M
full_name: Pechal, M
last_name: Pechal
- first_name: Stefan
full_name: Berger, Stefan T
last_name: Berger
- first_name: Abdufarrukh
full_name: Abdumalikov, Abdufarrukh A
last_name: Abdumalikov
- first_name: Johannes M
full_name: Johannes Fink
id: 4B591CBA-F248-11E8-B48F-1D18A9856A87
last_name: Fink
orcid: 0000-0001-8112-028X
- first_name: Jonas
full_name: Mlynek, Jonas A
last_name: Mlynek
- first_name: L.
full_name: Steffen, L. Kraig
last_name: Steffen
- first_name: Andreas
full_name: Wallraff, Andreas
last_name: Wallraff
- first_name: Stefan
full_name: Filipp, Stefan
last_name: Filipp
citation:
ama: Pechal M, Berger S, Abdumalikov A, et al. Geometric phase and nonadiabatic
effects in an electronic harmonic oscillator. Physical Review Letters.
2012;108(17). doi:10.1103/PhysRevLett.108.170401
apa: Pechal, M., Berger, S., Abdumalikov, A., Fink, J. M., Mlynek, J., Steffen,
L., … Filipp, S. (2012). Geometric phase and nonadiabatic effects in an electronic
harmonic oscillator. Physical Review Letters. American Physical Society.
https://doi.org/10.1103/PhysRevLett.108.170401
chicago: Pechal, M, Stefan Berger, Abdufarrukh Abdumalikov, Johannes M Fink, Jonas
Mlynek, L. Steffen, Andreas Wallraff, and Stefan Filipp. “Geometric Phase and
Nonadiabatic Effects in an Electronic Harmonic Oscillator.” Physical Review
Letters. American Physical Society, 2012. https://doi.org/10.1103/PhysRevLett.108.170401.
ieee: M. Pechal et al., “Geometric phase and nonadiabatic effects in an electronic
harmonic oscillator,” Physical Review Letters, vol. 108, no. 17. American
Physical Society, 2012.
ista: Pechal M, Berger S, Abdumalikov A, Fink JM, Mlynek J, Steffen L, Wallraff
A, Filipp S. 2012. Geometric phase and nonadiabatic effects in an electronic harmonic
oscillator. Physical Review Letters. 108(17).
mla: Pechal, M., et al. “Geometric Phase and Nonadiabatic Effects in an Electronic
Harmonic Oscillator.” Physical Review Letters, vol. 108, no. 17, American
Physical Society, 2012, doi:10.1103/PhysRevLett.108.170401.
short: M. Pechal, S. Berger, A. Abdumalikov, J.M. Fink, J. Mlynek, L. Steffen, A.
Wallraff, S. Filipp, Physical Review Letters 108 (2012).
date_created: 2018-12-11T11:53:59Z
date_published: 2012-04-23T00:00:00Z
date_updated: 2021-01-12T06:53:10Z
day: '23'
doi: 10.1103/PhysRevLett.108.170401
extern: 1
intvolume: ' 108'
issue: '17'
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/1109.1157
month: '04'
oa: 1
publication: Physical Review Letters
publication_status: published
publisher: American Physical Society
publist_id: '5333'
quality_controlled: 0
status: public
title: Geometric phase and nonadiabatic effects in an electronic harmonic oscillator
type: journal_article
volume: 108
year: '2012'
...
---
_id: '1783'
abstract:
- lang: eng
text: Nonlinearity and entanglement are two important properties by which physical
systems can be identified as nonclassical. We study the dynamics of the resonant
interaction of up to N=3 two-level systems and a single mode of the electromagnetic
field sharing a single excitation dynamically. We observe coherent vacuum Rabi
oscillations and their nonlinear √N speedup by tracking the populations of all
qubits and the resonator in time. We use quantum state tomography to show explicitly
that the dynamics generates maximally entangled states of the W class in a time
limited only by the collective interaction rate. We use an entanglement witness
and the 3-tangle to characterize the state whose fidelity F=78% is limited in
our experiments by crosstalk arising during the simultaneous qubit manipulations
which is absent in a sequential approach with F=91%.
acknowledgement: This work was supported by the Swiss National Science Foundation
(SNF) and the EU IP SOLID
author:
- first_name: Jonas
full_name: Mlynek, Jonas A
last_name: Mlynek
- first_name: Abdufarrukh
full_name: Abdumalikov, Abdufarrukh A
last_name: Abdumalikov
- first_name: Johannes M
full_name: Johannes Fink
id: 4B591CBA-F248-11E8-B48F-1D18A9856A87
last_name: Fink
orcid: 0000-0001-8112-028X
- first_name: L.
full_name: Steffen, L. Kraig
last_name: Steffen
- first_name: Matthias
full_name: Baur, Matthias P
last_name: Baur
- first_name: C
full_name: Lang, C
last_name: Lang
- first_name: Arjan
full_name: Van Loo, Arjan F
last_name: Van Loo
- first_name: Andreas
full_name: Wallraff, Andreas
last_name: Wallraff
citation:
ama: Mlynek J, Abdumalikov A, Fink JM, et al. Demonstrating W-type entanglement
of Dicke states in resonant cavity quantum electrodynamics. Physical Review
A - Atomic, Molecular, and Optical Physics. 2012;86(5). doi:10.1103/PhysRevA.86.053838
apa: Mlynek, J., Abdumalikov, A., Fink, J. M., Steffen, L., Baur, M., Lang, C.,
… Wallraff, A. (2012). Demonstrating W-type entanglement of Dicke states in resonant
cavity quantum electrodynamics. Physical Review A - Atomic, Molecular, and
Optical Physics. American Physical Society. https://doi.org/10.1103/PhysRevA.86.053838
chicago: Mlynek, Jonas, Abdufarrukh Abdumalikov, Johannes M Fink, L. Steffen, Matthias
Baur, C Lang, Arjan Van Loo, and Andreas Wallraff. “Demonstrating W-Type Entanglement
of Dicke States in Resonant Cavity Quantum Electrodynamics.” Physical Review
A - Atomic, Molecular, and Optical Physics. American Physical Society, 2012.
https://doi.org/10.1103/PhysRevA.86.053838.
ieee: J. Mlynek et al., “Demonstrating W-type entanglement of Dicke states
in resonant cavity quantum electrodynamics,” Physical Review A - Atomic, Molecular,
and Optical Physics, vol. 86, no. 5. American Physical Society, 2012.
ista: Mlynek J, Abdumalikov A, Fink JM, Steffen L, Baur M, Lang C, Van Loo A, Wallraff
A. 2012. Demonstrating W-type entanglement of Dicke states in resonant cavity
quantum electrodynamics. Physical Review A - Atomic, Molecular, and Optical Physics.
86(5).
mla: Mlynek, Jonas, et al. “Demonstrating W-Type Entanglement of Dicke States in
Resonant Cavity Quantum Electrodynamics.” Physical Review A - Atomic, Molecular,
and Optical Physics, vol. 86, no. 5, American Physical Society, 2012, doi:10.1103/PhysRevA.86.053838.
short: J. Mlynek, A. Abdumalikov, J.M. Fink, L. Steffen, M. Baur, C. Lang, A. Van
Loo, A. Wallraff, Physical Review A - Atomic, Molecular, and Optical Physics 86
(2012).
date_created: 2018-12-11T11:53:59Z
date_published: 2012-11-30T00:00:00Z
date_updated: 2021-01-12T06:53:10Z
day: '30'
doi: 10.1103/PhysRevA.86.053838
extern: 1
intvolume: ' 86'
issue: '5'
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/1202.5191
month: '11'
oa: 1
publication: Physical Review A - Atomic, Molecular, and Optical Physics
publication_status: published
publisher: American Physical Society
publist_id: '5332'
quality_controlled: 0
status: public
title: Demonstrating W-type entanglement of Dicke states in resonant cavity quantum
electrodynamics
type: journal_article
volume: 86
year: '2012'
...
---
_id: '1784'
abstract:
- lang: eng
text: A localized qubit entangled with a propagating quantum field is well suited
to study nonlocal aspects of quantum mechanics and may also provide a channel
to communicate between spatially separated nodes in a quantum network. Here, we
report the on-demand generation and characterization of Bell-type entangled states
between a superconducting qubit and propagating microwave fields composed of zero-,
one-, and two-photon Fock states. Using low noise linear amplification and efficient
data acquisition we extract all relevant correlations between the qubit and the
photon states and demonstrate entanglement with high fidelity.
acknowledgement: This work was supported by the European Research Council (ERC) through
a Starting Grant and by ETHZ
author:
- first_name: Christopher
full_name: Eichler, Christopher
last_name: Eichler
- first_name: C
full_name: Lang, C
last_name: Lang
- first_name: Johannes M
full_name: Johannes Fink
id: 4B591CBA-F248-11E8-B48F-1D18A9856A87
last_name: Fink
orcid: 0000-0001-8112-028X
- first_name: J
full_name: Govenius, J
last_name: Govenius
- first_name: Stefan
full_name: Filipp, Stefan
last_name: Filipp
- first_name: Andreas
full_name: Wallraff, Andreas
last_name: Wallraff
citation:
ama: Eichler C, Lang C, Fink JM, Govenius J, Filipp S, Wallraff A. Observation of
entanglement between itinerant microwave photons and a superconducting qubit.
Physical Review Letters. 2012;109(24). doi:10.1103/PhysRevLett.109.240501
apa: Eichler, C., Lang, C., Fink, J. M., Govenius, J., Filipp, S., & Wallraff,
A. (2012). Observation of entanglement between itinerant microwave photons and
a superconducting qubit. Physical Review Letters. American Physical Society.
https://doi.org/10.1103/PhysRevLett.109.240501
chicago: Eichler, Christopher, C Lang, Johannes M Fink, J Govenius, Stefan Filipp,
and Andreas Wallraff. “Observation of Entanglement between Itinerant Microwave
Photons and a Superconducting Qubit.” Physical Review Letters. American
Physical Society, 2012. https://doi.org/10.1103/PhysRevLett.109.240501.
ieee: C. Eichler, C. Lang, J. M. Fink, J. Govenius, S. Filipp, and A. Wallraff,
“Observation of entanglement between itinerant microwave photons and a superconducting
qubit,” Physical Review Letters, vol. 109, no. 24. American Physical Society,
2012.
ista: Eichler C, Lang C, Fink JM, Govenius J, Filipp S, Wallraff A. 2012. Observation
of entanglement between itinerant microwave photons and a superconducting qubit.
Physical Review Letters. 109(24).
mla: Eichler, Christopher, et al. “Observation of Entanglement between Itinerant
Microwave Photons and a Superconducting Qubit.” Physical Review Letters,
vol. 109, no. 24, American Physical Society, 2012, doi:10.1103/PhysRevLett.109.240501.
short: C. Eichler, C. Lang, J.M. Fink, J. Govenius, S. Filipp, A. Wallraff, Physical
Review Letters 109 (2012).
date_created: 2018-12-11T11:53:59Z
date_published: 2012-12-10T00:00:00Z
date_updated: 2021-01-12T06:53:10Z
day: '10'
doi: 10.1103/PhysRevLett.109.240501
extern: 1
intvolume: ' 109'
issue: '24'
main_file_link:
- open_access: '0'
url: http://arxiv.org/abs/1209.0441
month: '12'
publication: Physical Review Letters
publication_status: published
publisher: American Physical Society
publist_id: '5330'
quality_controlled: 0
status: public
title: Observation of entanglement between itinerant microwave photons and a superconducting
qubit
type: journal_article
volume: 109
year: '2012'
...
---
OA_type: closed access
_id: '18000'
abstract:
- lang: eng
text: Measurement of electronics and mechanics of single molecules provides a fundamental
understanding of conductance as well as bonding at the atomic scale. To study
the mechanics at these length scales, we have built a conducting atomic force
microscope (AFM) optimized for high displacement and force resolution. Here, we
simultaneously measure conductance and force across single Au-molecule-Au junctions
in order to obtain complementary information about the electronics and structure
in these systems. First we show that single-atom Au contacts, which have a conductance
of G0 (2e2/h), have a rupture force of about 1.4 nN, in excellent agreement with
previous theoretical and experimental studies. For a series of amine and pyridine
linked molecules which are bound to Au electrodes through an Au-N donor-acceptor
bond, we observe that the rupture force depends on the backbone chemistry and
can range from 0.5 to 0.8 nN. We also study junctions formed with molecules that
bind through P-Au and S-Au interactions. We find that both the conductance signatures
and junction evolution of covalent S-Au bond (thiolate) and a donor-acceptor S-Au
bond (thiol) are dramatically different. Finally, we perform density functional
theory based adiabatic molecular junction elongation and rupture calculations
which give us an insight into the underlying mechanisms in these experiments.
alternative_title:
- MEMS
article_processing_charge: No
author:
- first_name: Sriharsha V.
full_name: Aradhya, Sriharsha V.
last_name: Aradhya
- first_name: Michael
full_name: Frei, Michael
last_name: Frei
- first_name: Mark S.
full_name: Hybertsen, Mark S.
last_name: Hybertsen
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
citation:
ama: 'Aradhya SV, Frei M, Hybertsen MS, Venkataraman L. Simultaneous measurement
of force and conductance across single molecule junctions. In: Proceedings
of the 2012 Annual Conference on Experimental and Applied Mechanics. Vol 6.
Springer Nature; 2012:75-84. doi:10.1007/978-1-4614-4436-7_12'
apa: 'Aradhya, S. V., Frei, M., Hybertsen, M. S., & Venkataraman, L. (2012).
Simultaneous measurement of force and conductance across single molecule junctions.
In Proceedings of the 2012 Annual Conference on Experimental and Applied Mechanics
(Vol. 6, pp. 75–84). Costa Mesa, CA, United States: Springer Nature. https://doi.org/10.1007/978-1-4614-4436-7_12'
chicago: Aradhya, Sriharsha V., Michael Frei, Mark S. Hybertsen, and Latha Venkataraman.
“Simultaneous Measurement of Force and Conductance across Single Molecule Junctions.”
In Proceedings of the 2012 Annual Conference on Experimental and Applied Mechanics,
6:75–84. Springer Nature, 2012. https://doi.org/10.1007/978-1-4614-4436-7_12.
ieee: S. V. Aradhya, M. Frei, M. S. Hybertsen, and L. Venkataraman, “Simultaneous
measurement of force and conductance across single molecule junctions,” in Proceedings
of the 2012 Annual Conference on Experimental and Applied Mechanics, Costa
Mesa, CA, United States, 2012, vol. 6, pp. 75–84.
ista: Aradhya SV, Frei M, Hybertsen MS, Venkataraman L. 2012. Simultaneous measurement
of force and conductance across single molecule junctions. Proceedings of the
2012 Annual Conference on Experimental and Applied Mechanics. Conference on Experimental
and Applied Mechanics, MEMS, vol. 6, 75–84.
mla: Aradhya, Sriharsha V., et al. “Simultaneous Measurement of Force and Conductance
across Single Molecule Junctions.” Proceedings of the 2012 Annual Conference
on Experimental and Applied Mechanics, vol. 6, Springer Nature, 2012, pp.
75–84, doi:10.1007/978-1-4614-4436-7_12.
short: S.V. Aradhya, M. Frei, M.S. Hybertsen, L. Venkataraman, in:, Proceedings
of the 2012 Annual Conference on Experimental and Applied Mechanics, Springer
Nature, 2012, pp. 75–84.
conference:
end_date: 2012-06-14
location: Costa Mesa, CA, United States
name: Conference on Experimental and Applied Mechanics
start_date: 2012-06-11
date_created: 2024-09-09T11:38:46Z
date_published: 2012-06-01T00:00:00Z
date_updated: 2025-01-03T08:16:32Z
day: '01'
doi: 10.1007/978-1-4614-4436-7_12
extern: '1'
intvolume: ' 6'
language:
- iso: eng
month: '06'
oa_version: None
page: 75-84
publication: Proceedings of the 2012 Annual Conference on Experimental and Applied
Mechanics
publication_identifier:
eisbn:
- '9781461444367'
eissn:
- 2191-5652
isbn:
- '9781461444350'
issn:
- 2191-5644
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Simultaneous measurement of force and conductance across single molecule junctions
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 6
year: '2012'
...
---
OA_type: closed access
_id: '18001'
abstract:
- lang: eng
text: 'We study the effects of molecular structure on the electronic transport and
mechanical stability of single-molecule junctions formed with Au point contacts.
Two types of linear conjugated molecular wires are compared: those functionalized
with methylsulfide or amine aurophilic groups at (1) both or (2) only one of its
phenyl termini. Using scanning tunneling and atomic force microscope break-junction
techniques, the conductance of mono- and difunctionalized molecular wires and
its dependence on junction elongation and rupture forces were studied. Charge
transport through monofunctionalized wires is observed when the molecular bridge
is coupled through a S–Au donor–acceptor bond on one end and a relatively weak
Au−π interaction on the other end. For monofunctionalized molecular wires, junctions
can be mechanically stabilized by installing a second aurophilic group at the
meta position that, however, does not in itself contribute to a new conduction
pathway. These results reveal the important interplay between electronic coupling
through metal−π interactions and quantum mechanical effects introduced by chemical
substitution on the conjugated system. This study affords a strategy to deterministically
tune the electrical and mechanical properties through molecular wires.'
article_processing_charge: No
article_type: original
author:
- first_name: Jeffrey S.
full_name: Meisner, Jeffrey S.
last_name: Meisner
- first_name: Seokhoon
full_name: Ahn, Seokhoon
last_name: Ahn
- first_name: Sriharsha V.
full_name: Aradhya, Sriharsha V.
last_name: Aradhya
- first_name: Markrete
full_name: Krikorian, Markrete
last_name: Krikorian
- first_name: Radha
full_name: Parameswaran, Radha
last_name: Parameswaran
- first_name: Michael
full_name: Steigerwald, Michael
last_name: Steigerwald
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
- first_name: Colin
full_name: Nuckolls, Colin
last_name: Nuckolls
citation:
ama: Meisner JS, Ahn S, Aradhya SV, et al. Importance of direct metal−π coupling
in electronic transport through conjugated single-molecule junctions. Journal
of the American Chemical Society. 2012;134(50):20440-20445. doi:10.1021/ja308626m
apa: Meisner, J. S., Ahn, S., Aradhya, S. V., Krikorian, M., Parameswaran, R., Steigerwald,
M., … Nuckolls, C. (2012). Importance of direct metal−π coupling in electronic
transport through conjugated single-molecule junctions. Journal of the American
Chemical Society. American Chemical Society. https://doi.org/10.1021/ja308626m
chicago: Meisner, Jeffrey S., Seokhoon Ahn, Sriharsha V. Aradhya, Markrete Krikorian,
Radha Parameswaran, Michael Steigerwald, Latha Venkataraman, and Colin Nuckolls.
“Importance of Direct Metal−π Coupling in Electronic Transport through Conjugated
Single-Molecule Junctions.” Journal of the American Chemical Society. American
Chemical Society, 2012. https://doi.org/10.1021/ja308626m.
ieee: J. S. Meisner et al., “Importance of direct metal−π coupling in electronic
transport through conjugated single-molecule junctions,” Journal of the American
Chemical Society, vol. 134, no. 50. American Chemical Society, pp. 20440–20445,
2012.
ista: Meisner JS, Ahn S, Aradhya SV, Krikorian M, Parameswaran R, Steigerwald M,
Venkataraman L, Nuckolls C. 2012. Importance of direct metal−π coupling in electronic
transport through conjugated single-molecule junctions. Journal of the American
Chemical Society. 134(50), 20440–20445.
mla: Meisner, Jeffrey S., et al. “Importance of Direct Metal−π Coupling in Electronic
Transport through Conjugated Single-Molecule Junctions.” Journal of the American
Chemical Society, vol. 134, no. 50, American Chemical Society, 2012, pp. 20440–45,
doi:10.1021/ja308626m.
short: J.S. Meisner, S. Ahn, S.V. Aradhya, M. Krikorian, R. Parameswaran, M. Steigerwald,
L. Venkataraman, C. Nuckolls, Journal of the American Chemical Society 134 (2012)
20440–20445.
date_created: 2024-09-09T11:39:25Z
date_published: 2012-11-21T00:00:00Z
date_updated: 2025-01-03T08:54:09Z
day: '21'
doi: 10.1021/ja308626m
extern: '1'
external_id:
pmid:
- '23167533'
intvolume: ' 134'
issue: '50'
language:
- iso: eng
month: '11'
oa_version: None
page: 20440-20445
pmid: 1
publication: Journal of the American Chemical Society
publication_identifier:
eissn:
- 1520-5126
issn:
- 0002-7863
publication_status: published
publisher: American Chemical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Importance of direct metal−π coupling in electronic transport through conjugated
single-molecule junctions
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 134
year: '2012'
...
---
OA_place: repository
OA_type: green
_id: '18002'
abstract:
- lang: eng
text: Using self-energy-corrected density functional theory (DFT) and a coherent
scattering-state approach, we explain current–voltage (IV) measurements of four
pyridine-Au and amine-Au linked molecular junctions with quantitative accuracy.
Parameter-free many-electron self-energy corrections to DFT Kohn–Sham eigenvalues
are demonstrated to lead to excellent agreement with experiments at finite bias,
improving upon order-of-magnitude errors in currents obtained with standard DFT
approaches. We further propose an approximate route for prediction of quantitative
IV characteristics for both symmetric and asymmetric molecular junctions based
on linear response theory and knowledge of the Stark shifts of junction resonance
energies. Our work demonstrates that a quantitative, computationally inexpensive
description of coherent transport in molecular junctions is readily achievable,
enabling new understanding and control of charge transport properties of molecular-scale
interfaces at large bias voltages.
article_processing_charge: No
article_type: letter_note
arxiv: 1
author:
- first_name: Pierre
full_name: Darancet, Pierre
last_name: Darancet
- first_name: Jonathan R.
full_name: Widawsky, Jonathan R.
last_name: Widawsky
- first_name: Hyoung Joon
full_name: Choi, Hyoung Joon
last_name: Choi
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
- first_name: Jeffrey B.
full_name: Neaton, Jeffrey B.
last_name: Neaton
citation:
ama: Darancet P, Widawsky JR, Choi HJ, Venkataraman L, Neaton JB. Quantitative current–voltage
characteristics in molecular junctions from first principles. Nano Letters.
2012;12(12):6250-6254. doi:10.1021/nl3033137
apa: Darancet, P., Widawsky, J. R., Choi, H. J., Venkataraman, L., & Neaton,
J. B. (2012). Quantitative current–voltage characteristics in molecular junctions
from first principles. Nano Letters. American Chemical Society. https://doi.org/10.1021/nl3033137
chicago: Darancet, Pierre, Jonathan R. Widawsky, Hyoung Joon Choi, Latha Venkataraman,
and Jeffrey B. Neaton. “Quantitative Current–Voltage Characteristics in Molecular
Junctions from First Principles.” Nano Letters. American Chemical Society,
2012. https://doi.org/10.1021/nl3033137.
ieee: P. Darancet, J. R. Widawsky, H. J. Choi, L. Venkataraman, and J. B. Neaton,
“Quantitative current–voltage characteristics in molecular junctions from first
principles,” Nano Letters, vol. 12, no. 12. American Chemical Society,
pp. 6250–6254, 2012.
ista: Darancet P, Widawsky JR, Choi HJ, Venkataraman L, Neaton JB. 2012. Quantitative
current–voltage characteristics in molecular junctions from first principles.
Nano Letters. 12(12), 6250–6254.
mla: Darancet, Pierre, et al. “Quantitative Current–Voltage Characteristics in Molecular
Junctions from First Principles.” Nano Letters, vol. 12, no. 12, American
Chemical Society, 2012, pp. 6250–54, doi:10.1021/nl3033137.
short: P. Darancet, J.R. Widawsky, H.J. Choi, L. Venkataraman, J.B. Neaton, Nano
Letters 12 (2012) 6250–6254.
date_created: 2024-09-09T11:40:06Z
date_published: 2012-11-20T00:00:00Z
date_updated: 2025-01-03T08:56:21Z
day: '20'
doi: 10.1021/nl3033137
extern: '1'
external_id:
arxiv:
- '1212.0019'
intvolume: ' 12'
issue: '12'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1212.0019
month: '11'
oa: 1
oa_version: Preprint
page: 6250-6254
publication: Nano Letters
publication_identifier:
eissn:
- 1530-6992
issn:
- 1530-6984
publication_status: published
publisher: American Chemical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Quantitative current–voltage characteristics in molecular junctions from first
principles
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 12
year: '2012'
...
---
OA_type: closed access
_id: '18003'
article_processing_charge: No
article_type: letter_note
author:
- first_name: Xavier
full_name: Roy, Xavier
last_name: Roy
- first_name: Christine L.
full_name: Schenck, Christine L.
last_name: Schenck
- first_name: Seokhoon
full_name: Ahn, Seokhoon
last_name: Ahn
- first_name: Roger A.
full_name: Lalancette, Roger A.
last_name: Lalancette
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
- first_name: Colin
full_name: Nuckolls, Colin
last_name: Nuckolls
- first_name: Michael L.
full_name: Steigerwald, Michael L.
last_name: Steigerwald
citation:
ama: Roy X, Schenck CL, Ahn S, et al. Quantum soldering of individual quantum dots.
Angewandte Chemie International Edition. 2012;51(50):12473-12476. doi:10.1002/anie.201206301
apa: Roy, X., Schenck, C. L., Ahn, S., Lalancette, R. A., Venkataraman, L., Nuckolls,
C., & Steigerwald, M. L. (2012). Quantum soldering of individual quantum dots.
Angewandte Chemie International Edition. Wiley. https://doi.org/10.1002/anie.201206301
chicago: Roy, Xavier, Christine L. Schenck, Seokhoon Ahn, Roger A. Lalancette, Latha
Venkataraman, Colin Nuckolls, and Michael L. Steigerwald. “Quantum Soldering of
Individual Quantum Dots.” Angewandte Chemie International Edition. Wiley,
2012. https://doi.org/10.1002/anie.201206301.
ieee: X. Roy et al., “Quantum soldering of individual quantum dots,” Angewandte
Chemie International Edition, vol. 51, no. 50. Wiley, pp. 12473–12476, 2012.
ista: Roy X, Schenck CL, Ahn S, Lalancette RA, Venkataraman L, Nuckolls C, Steigerwald
ML. 2012. Quantum soldering of individual quantum dots. Angewandte Chemie International
Edition. 51(50), 12473–12476.
mla: Roy, Xavier, et al. “Quantum Soldering of Individual Quantum Dots.” Angewandte
Chemie International Edition, vol. 51, no. 50, Wiley, 2012, pp. 12473–76,
doi:10.1002/anie.201206301.
short: X. Roy, C.L. Schenck, S. Ahn, R.A. Lalancette, L. Venkataraman, C. Nuckolls,
M.L. Steigerwald, Angewandte Chemie International Edition 51 (2012) 12473–12476.
date_created: 2024-09-09T11:41:01Z
date_published: 2012-11-07T00:00:00Z
date_updated: 2025-01-03T08:58:55Z
day: '07'
doi: 10.1002/anie.201206301
extern: '1'
external_id:
pmid:
- '23135896'
intvolume: ' 51'
issue: '50'
language:
- iso: eng
month: '11'
oa_version: None
page: 12473-12476
pmid: 1
publication: Angewandte Chemie International Edition
publication_identifier:
eissn:
- 1521-3773
issn:
- 1433-7851
publication_status: published
publisher: Wiley
quality_controlled: '1'
scopus_import: '1'
status: public
title: Quantum soldering of individual quantum dots
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 51
year: '2012'
...
---
OA_type: closed access
_id: '18004'
abstract:
- lang: eng
text: We characterize electron transport across Au–molecule–Au junctions of heterogeneous
carboxyl and methyl sulfide terminated saturated and conjugated molecules. Low-bias
conductance measurements are performed using the scanning tunneling microscopy
based break-junction technique in the presence of solvents and at room temperature.
For a series of alkanes with 1–4 carbon atoms in the hydrocarbon chain, our results
show an exponential decrease in conductance with increasing molecule length characterized
by a decay constant of 0.9 ± 0.1 per methylene group. Control measurements in
pH 11 solutions and with COOMe terminations suggest that the carboxylic acid group
binds through the formation of a COO−–Au bond. Simultaneous measurements of conductance
and force across these junctions yield a rupture force of 0.6 ± 0.1 nN, comparable
to that required to rupture a Au–SMe bond. By establishing reliable, in situ junction
formation, these experiments provide a new approach to probe electronic properties
of carboxyl groups at the single molecule level.
article_number: '13841'
article_processing_charge: No
article_type: original
author:
- first_name: Seokhoon
full_name: Ahn, Seokhoon
last_name: Ahn
- first_name: Sriharsha V.
full_name: Aradhya, Sriharsha V.
last_name: Aradhya
- first_name: Rebekka S.
full_name: Klausen, Rebekka S.
last_name: Klausen
- first_name: Brian
full_name: Capozzi, Brian
last_name: Capozzi
- first_name: Xavier
full_name: Roy, Xavier
last_name: Roy
- first_name: Michael L.
full_name: Steigerwald, Michael L.
last_name: Steigerwald
- first_name: Colin
full_name: Nuckolls, Colin
last_name: Nuckolls
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
citation:
ama: Ahn S, Aradhya SV, Klausen RS, et al. Electronic transport and mechanical stability
of carboxyl linked single-molecule junctions. Physical Chemistry Chemical Physics.
2012;14(40). doi:10.1039/c2cp41578j
apa: Ahn, S., Aradhya, S. V., Klausen, R. S., Capozzi, B., Roy, X., Steigerwald,
M. L., … Venkataraman, L. (2012). Electronic transport and mechanical stability
of carboxyl linked single-molecule junctions. Physical Chemistry Chemical Physics.
Royal Society of Chemistry. https://doi.org/10.1039/c2cp41578j
chicago: Ahn, Seokhoon, Sriharsha V. Aradhya, Rebekka S. Klausen, Brian Capozzi,
Xavier Roy, Michael L. Steigerwald, Colin Nuckolls, and Latha Venkataraman. “Electronic
Transport and Mechanical Stability of Carboxyl Linked Single-Molecule Junctions.”
Physical Chemistry Chemical Physics. Royal Society of Chemistry, 2012.
https://doi.org/10.1039/c2cp41578j.
ieee: S. Ahn et al., “Electronic transport and mechanical stability of carboxyl
linked single-molecule junctions,” Physical Chemistry Chemical Physics,
vol. 14, no. 40. Royal Society of Chemistry, 2012.
ista: Ahn S, Aradhya SV, Klausen RS, Capozzi B, Roy X, Steigerwald ML, Nuckolls
C, Venkataraman L. 2012. Electronic transport and mechanical stability of carboxyl
linked single-molecule junctions. Physical Chemistry Chemical Physics. 14(40),
13841.
mla: Ahn, Seokhoon, et al. “Electronic Transport and Mechanical Stability of Carboxyl
Linked Single-Molecule Junctions.” Physical Chemistry Chemical Physics,
vol. 14, no. 40, 13841, Royal Society of Chemistry, 2012, doi:10.1039/c2cp41578j.
short: S. Ahn, S.V. Aradhya, R.S. Klausen, B. Capozzi, X. Roy, M.L. Steigerwald,
C. Nuckolls, L. Venkataraman, Physical Chemistry Chemical Physics 14 (2012).
date_created: 2024-09-09T12:00:50Z
date_published: 2012-07-09T00:00:00Z
date_updated: 2025-01-03T09:01:38Z
day: '09'
doi: 10.1039/c2cp41578j
extern: '1'
external_id:
pmid:
- '22850823'
intvolume: ' 14'
issue: '40'
language:
- iso: eng
month: '07'
oa_version: None
pmid: 1
publication: Physical Chemistry Chemical Physics
publication_identifier:
eissn:
- 1463-9084
issn:
- 1463-9076
publication_status: published
publisher: Royal Society of Chemistry
quality_controlled: '1'
scopus_import: '1'
status: public
title: Electronic transport and mechanical stability of carboxyl linked single-molecule
junctions
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 14
year: '2012'
...
---
OA_type: closed access
_id: '18006'
abstract:
- lang: eng
text: Understanding the role of intermolecular interaction on through-space charge
transfer characteristics in π-stacked molecular systems is central to the rational
design of electronic materials. However, a quantitative study of charge transfer
in such systems is often difficult because of poor control over molecular morphology.
Here we use the core-hole clock implementation of resonant photoemission spectroscopy
to study the femtosecond charge-transfer dynamics in cyclophanes, which consist
of two precisely stacked π-systems held together by aliphatic chains. We study
two systems, [2,2]paracyclophane (22PCP) and [4,4]paracyclophane (44PCP), with
inter-ring separations of 3.0 and 4.0 Å, respectively. We find that charge transfer
across the π-coupled system of 44PCP is 20 times slower than in 22PCP. We attribute
this difference to the decreased inter-ring electronic coupling in 44PCP. These
measurements illustrate the use of core-hole clock spectroscopy as a general tool
for quantifying through-space coupling in π-stacked systems.
article_number: '1086'
article_processing_charge: No
article_type: original
author:
- first_name: Arunabh
full_name: Batra, Arunabh
last_name: Batra
- first_name: Gregor
full_name: Kladnik, Gregor
last_name: Kladnik
- first_name: Héctor
full_name: Vázquez, Héctor
last_name: Vázquez
- first_name: Jeffrey S.
full_name: Meisner, Jeffrey S.
last_name: Meisner
- first_name: Luca
full_name: Floreano, Luca
last_name: Floreano
- first_name: Colin
full_name: Nuckolls, Colin
last_name: Nuckolls
- first_name: Dean
full_name: Cvetko, Dean
last_name: Cvetko
- first_name: Alberto
full_name: Morgante, Alberto
last_name: Morgante
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
citation:
ama: Batra A, Kladnik G, Vázquez H, et al. Quantifying through-space charge transfer
dynamics in π-coupled molecular systems. Nature Communications. 2012;3.
doi:10.1038/ncomms2083
apa: Batra, A., Kladnik, G., Vázquez, H., Meisner, J. S., Floreano, L., Nuckolls,
C., … Venkataraman, L. (2012). Quantifying through-space charge transfer dynamics
in π-coupled molecular systems. Nature Communications. Springer Nature.
https://doi.org/10.1038/ncomms2083
chicago: Batra, Arunabh, Gregor Kladnik, Héctor Vázquez, Jeffrey S. Meisner, Luca
Floreano, Colin Nuckolls, Dean Cvetko, Alberto Morgante, and Latha Venkataraman.
“Quantifying Through-Space Charge Transfer Dynamics in π-Coupled Molecular Systems.”
Nature Communications. Springer Nature, 2012. https://doi.org/10.1038/ncomms2083.
ieee: A. Batra et al., “Quantifying through-space charge transfer dynamics
in π-coupled molecular systems,” Nature Communications, vol. 3. Springer
Nature, 2012.
ista: Batra A, Kladnik G, Vázquez H, Meisner JS, Floreano L, Nuckolls C, Cvetko
D, Morgante A, Venkataraman L. 2012. Quantifying through-space charge transfer
dynamics in π-coupled molecular systems. Nature Communications. 3, 1086.
mla: Batra, Arunabh, et al. “Quantifying Through-Space Charge Transfer Dynamics
in π-Coupled Molecular Systems.” Nature Communications, vol. 3, 1086, Springer
Nature, 2012, doi:10.1038/ncomms2083.
short: A. Batra, G. Kladnik, H. Vázquez, J.S. Meisner, L. Floreano, C. Nuckolls,
D. Cvetko, A. Morgante, L. Venkataraman, Nature Communications 3 (2012).
date_created: 2024-09-09T12:27:41Z
date_published: 2012-09-25T00:00:00Z
date_updated: 2025-01-03T09:04:21Z
day: '25'
doi: 10.1038/ncomms2083
extern: '1'
external_id:
pmid:
- '23011140'
intvolume: ' 3'
language:
- iso: eng
month: '09'
oa_version: None
pmid: 1
publication: Nature Communications
publication_identifier:
issn:
- 2041-1723
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Quantifying through-space charge transfer dynamics in π-coupled molecular systems
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 3
year: '2012'
...
---
OA_type: closed access
_id: '18007'
abstract:
- lang: eng
text: According to Kirchhoff's circuit laws, the net conductance of two parallel
components in an electronic circuit is the sum of the individual conductances.
However, when the circuit dimensions are comparable to the electronic phase coherence
length, quantum interference effects play a critical role1, as exemplified by
the Aharonov–Bohm effect in metal rings2,3. At the molecular scale, interference
effects dramatically reduce the electron transfer rate through a meta-connected
benzene ring when compared with a para-connected benzene ring4,5. For longer conjugated
and cross-conjugated molecules, destructive interference effects have been observed
in the tunnelling conductance through molecular junctions6,7,8,9,10. Here, we
investigate the conductance superposition law for parallel components in single-molecule
circuits, particularly the role of interference. We synthesize a series of molecular
systems that contain either one backbone or two backbones in parallel, bonded
together cofacially by a common linker on each end. Single-molecule conductance
measurements and transport calculations based on density functional theory show
that the conductance of a double-backbone molecular junction can be more than
twice that of a single-backbone junction, providing clear evidence for constructive
interference.
article_processing_charge: No
article_type: original
author:
- first_name: H.
full_name: Vazquez, H.
last_name: Vazquez
- first_name: R.
full_name: Skouta, R.
last_name: Skouta
- first_name: S.
full_name: Schneebeli, S.
last_name: Schneebeli
- first_name: M.
full_name: Kamenetska, M.
last_name: Kamenetska
- first_name: R.
full_name: Breslow, R.
last_name: Breslow
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
- first_name: M.S.
full_name: Hybertsen, M.S.
last_name: Hybertsen
citation:
ama: Vazquez H, Skouta R, Schneebeli S, et al. Probing the conductance superposition
law in single-molecule circuits with parallel paths. Nature Nanotechnology.
2012;7(10):663-667. doi:10.1038/nnano.2012.147
apa: Vazquez, H., Skouta, R., Schneebeli, S., Kamenetska, M., Breslow, R., Venkataraman,
L., & Hybertsen, M. S. (2012). Probing the conductance superposition law in
single-molecule circuits with parallel paths. Nature Nanotechnology. Springer
Nature. https://doi.org/10.1038/nnano.2012.147
chicago: Vazquez, H., R. Skouta, S. Schneebeli, M. Kamenetska, R. Breslow, Latha
Venkataraman, and M.S. Hybertsen. “Probing the Conductance Superposition Law in
Single-Molecule Circuits with Parallel Paths.” Nature Nanotechnology. Springer
Nature, 2012. https://doi.org/10.1038/nnano.2012.147.
ieee: H. Vazquez et al., “Probing the conductance superposition law in single-molecule
circuits with parallel paths,” Nature Nanotechnology, vol. 7, no. 10. Springer
Nature, pp. 663–667, 2012.
ista: Vazquez H, Skouta R, Schneebeli S, Kamenetska M, Breslow R, Venkataraman L,
Hybertsen MS. 2012. Probing the conductance superposition law in single-molecule
circuits with parallel paths. Nature Nanotechnology. 7(10), 663–667.
mla: Vazquez, H., et al. “Probing the Conductance Superposition Law in Single-Molecule
Circuits with Parallel Paths.” Nature Nanotechnology, vol. 7, no. 10, Springer
Nature, 2012, pp. 663–67, doi:10.1038/nnano.2012.147.
short: H. Vazquez, R. Skouta, S. Schneebeli, M. Kamenetska, R. Breslow, L. Venkataraman,
M.S. Hybertsen, Nature Nanotechnology 7 (2012) 663–667.
date_created: 2024-09-09T12:28:28Z
date_published: 2012-09-02T00:00:00Z
date_updated: 2025-01-03T09:07:44Z
day: '02'
doi: 10.1038/nnano.2012.147
extern: '1'
external_id:
pmid:
- '22941403'
intvolume: ' 7'
issue: '10'
language:
- iso: eng
month: '09'
oa_version: None
page: 663-667
pmid: 1
publication: Nature Nanotechnology
publication_identifier:
eissn:
- 1748-3395
issn:
- 1748-3387
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Probing the conductance superposition law in single-molecule circuits with
parallel paths
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 7
year: '2012'
...
---
OA_type: closed access
_id: '18008'
abstract:
- lang: eng
text: The break-junction technique is widely used to measure electronic properties
of nanoscale junctions including metal point-contacts and single-molecule junctions.
In these measurements, conductance is measured as a function of electrode displacement
yielding data that is analyzed by constructing conductance histograms to determine
the most frequently observed conductance values in the nanoscale junctions. However
much of the rich physics in these measurements is lost in this simple analysis
technique. Conductance histograms cannot be used to study the statistical relation
of distinct junction configurations, to distinguish structurally different configurations
that have similar conductance values, or to obtain information on the relation
between conductance and junction elongation. Here, we give a detailed introduction
to a novel statistical analysis method based on the two-dimensional cross-correlation
histogram (2DCH) analysis of conductance traces and show that this method provides
new information about the relation of different junction configurations that occur
during the formation and evolution of metal and single-molecule junctions. We
first illustrate the different types of correlation effects by using simulated
conductance traces. We then apply this analysis method to several different experimental
examples. We show from break-junction measurements of different metal point-contacts
that in aluminum, the first conductance histogram peak corresponds to two different
junction structures. In tantalum, we identify the frequent absence of adhesive
instability. We show that conductance plateaus shift in a correlated manner in
iron and vanadium junctions. Finally, we highlight the applicability of the correlation
analysis to single-molecule platinum–CO–platinum and gold–4,4′-bipyridine–gold
junctions.
article_processing_charge: No
article_type: original
author:
- first_name: Péter
full_name: Makk, Péter
last_name: Makk
- first_name: Damian
full_name: Tomaszewski, Damian
last_name: Tomaszewski
- first_name: Jan
full_name: Martinek, Jan
last_name: Martinek
- first_name: Zoltán
full_name: Balogh, Zoltán
last_name: Balogh
- first_name: Szabolcs
full_name: Csonka, Szabolcs
last_name: Csonka
- first_name: Maciej
full_name: Wawrzyniak, Maciej
last_name: Wawrzyniak
- first_name: Michael
full_name: Frei, Michael
last_name: Frei
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
- first_name: András
full_name: Halbritter, András
last_name: Halbritter
citation:
ama: Makk P, Tomaszewski D, Martinek J, et al. Correlation analysis of atomic and
single-molecule junction conductance. ACS Nano. 2012;6(4):3411-3423. doi:10.1021/nn300440f
apa: Makk, P., Tomaszewski, D., Martinek, J., Balogh, Z., Csonka, S., Wawrzyniak,
M., … Halbritter, A. (2012). Correlation analysis of atomic and single-molecule
junction conductance. ACS Nano. American Chemical Society. https://doi.org/10.1021/nn300440f
chicago: Makk, Péter, Damian Tomaszewski, Jan Martinek, Zoltán Balogh, Szabolcs
Csonka, Maciej Wawrzyniak, Michael Frei, Latha Venkataraman, and András Halbritter.
“Correlation Analysis of Atomic and Single-Molecule Junction Conductance.” ACS
Nano. American Chemical Society, 2012. https://doi.org/10.1021/nn300440f.
ieee: P. Makk et al., “Correlation analysis of atomic and single-molecule
junction conductance,” ACS Nano, vol. 6, no. 4. American Chemical Society,
pp. 3411–3423, 2012.
ista: Makk P, Tomaszewski D, Martinek J, Balogh Z, Csonka S, Wawrzyniak M, Frei
M, Venkataraman L, Halbritter A. 2012. Correlation analysis of atomic and single-molecule
junction conductance. ACS Nano. 6(4), 3411–3423.
mla: Makk, Péter, et al. “Correlation Analysis of Atomic and Single-Molecule Junction
Conductance.” ACS Nano, vol. 6, no. 4, American Chemical Society, 2012,
pp. 3411–23, doi:10.1021/nn300440f.
short: P. Makk, D. Tomaszewski, J. Martinek, Z. Balogh, S. Csonka, M. Wawrzyniak,
M. Frei, L. Venkataraman, A. Halbritter, ACS Nano 6 (2012) 3411–3423.
date_created: 2024-09-09T12:29:11Z
date_published: 2012-03-07T00:00:00Z
date_updated: 2025-01-03T09:10:24Z
day: '07'
doi: 10.1021/nn300440f
extern: '1'
external_id:
pmid:
- '22397391'
intvolume: ' 6'
issue: '4'
language:
- iso: eng
month: '03'
oa_version: None
page: 3411-3423
pmid: 1
publication: ACS Nano
publication_identifier:
eissn:
- 1936-086X
issn:
- 1936-0851
publication_status: published
publisher: American Chemical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Correlation analysis of atomic and single-molecule junction conductance
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 6
year: '2012'
...
---
OA_type: closed access
_id: '18009'
abstract:
- lang: eng
text: Bulk silicon, the bedrock of information technology, consists of the deceptively
simple electronic structure of just Si–Si σ bonds. Diamond has the same lattice
structure as silicon, yet the two materials have dramatically different electronic
properties. Here we report the specific synthesis and electrical characterization
of a class of molecules, oligosilanes, that contain strongly interacting Si–Si
σ bonds, the essential components of the bulk semiconductor. We used the scanning
tunneling microscope-based break-junction technique to compare the single-molecule
conductance of these oligosilanes to those of alkanes. We found that the molecular
conductance decreases exponentially with increasing chain length with a decay
constant β = 0.27 ± 0.01 Å–1, comparable to that of a conjugated chain of C═C
π bonds. This result demonstrates the profound implications of σ conjugation for
the conductivity of silicon.
article_processing_charge: No
article_type: letter_note
author:
- first_name: Rebekka S.
full_name: Klausen, Rebekka S.
last_name: Klausen
- first_name: Jonathan R.
full_name: Widawsky, Jonathan R.
last_name: Widawsky
- first_name: Michael L.
full_name: Steigerwald, Michael L.
last_name: Steigerwald
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
- first_name: Colin
full_name: Nuckolls, Colin
last_name: Nuckolls
citation:
ama: Klausen RS, Widawsky JR, Steigerwald ML, Venkataraman L, Nuckolls C. Conductive
molecular silicon. Journal of the American Chemical Society. 2012;134(10):4541-4544.
doi:10.1021/ja211677q
apa: Klausen, R. S., Widawsky, J. R., Steigerwald, M. L., Venkataraman, L., &
Nuckolls, C. (2012). Conductive molecular silicon. Journal of the American
Chemical Society. American Chemical Society. https://doi.org/10.1021/ja211677q
chicago: Klausen, Rebekka S., Jonathan R. Widawsky, Michael L. Steigerwald, Latha
Venkataraman, and Colin Nuckolls. “Conductive Molecular Silicon.” Journal of
the American Chemical Society. American Chemical Society, 2012. https://doi.org/10.1021/ja211677q.
ieee: R. S. Klausen, J. R. Widawsky, M. L. Steigerwald, L. Venkataraman, and C.
Nuckolls, “Conductive molecular silicon,” Journal of the American Chemical
Society, vol. 134, no. 10. American Chemical Society, pp. 4541–4544, 2012.
ista: Klausen RS, Widawsky JR, Steigerwald ML, Venkataraman L, Nuckolls C. 2012.
Conductive molecular silicon. Journal of the American Chemical Society. 134(10),
4541–4544.
mla: Klausen, Rebekka S., et al. “Conductive Molecular Silicon.” Journal of the
American Chemical Society, vol. 134, no. 10, American Chemical Society, 2012,
pp. 4541–44, doi:10.1021/ja211677q.
short: R.S. Klausen, J.R. Widawsky, M.L. Steigerwald, L. Venkataraman, C. Nuckolls,
Journal of the American Chemical Society 134 (2012) 4541–4544.
date_created: 2024-09-09T12:29:56Z
date_published: 2012-02-21T00:00:00Z
date_updated: 2025-01-03T09:14:29Z
day: '21'
doi: 10.1021/ja211677q
extern: '1'
external_id:
pmid:
- '22352896'
intvolume: ' 134'
issue: '10'
language:
- iso: eng
month: '02'
oa_version: None
page: 4541-4544
pmid: 1
publication: Journal of the American Chemical Society
publication_identifier:
eissn:
- 1520-5126
issn:
- 0002-7863
publication_status: published
publisher: American Chemical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Conductive molecular silicon
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 134
year: '2012'
...
---
_id: '1801'
abstract:
- lang: eng
text: Brain circuits are assembled from a large variety of morphologically and functionally
diverse cell types. It is not known how the intermingled cell types of an individual
adult brain region differ in their expressed genomes. Here we describe an atlas
of cell type transcriptomes in one brain region, the mouse retina. We found that
each adult cell type expressed a specific set of genes, including a unique set
of transcription factors, forming a 'barcode' for cell identity. Cell type transcriptomes
carried enough information to categorize cells into morphological classes and
types. Several genes that were specifically expressed in particular retinal circuit
elements, such as inhibitory neuron types, are associated with eye diseases. The
resource described here allows gene expression to be compared across adult retinal
cell types, experimenting with specific transcription factors to differentiate
stem or somatic cells to retinal cell types, and predicting cellular targets of
newly discovered disease-associated genes.
acknowledgement: The study was supported by Friedrich Miescher Institute funds, Alcon
award, a National Center of Competence in Research Genetics grant, a European Research
Council grant, a Swiss-Hungarian grant, and RETICIRC, TREATRUSH, SEEBETTER and OPTONEURO
grants from the European Union to B.R.
author:
- first_name: Sandra
full_name: Sandra Siegert
id: 36ACD32E-F248-11E8-B48F-1D18A9856A87
last_name: Siegert
orcid: 0000-0001-8635-0877
- first_name: Erik
full_name: Cabuy, Erik
last_name: Cabuy
- first_name: Brigitte
full_name: Scherf, Brigitte G
last_name: Scherf
- first_name: Hubertus
full_name: Kohler, Hubertus
last_name: Kohler
- first_name: Satchidananda
full_name: Panda, Satchidananda
last_name: Panda
- first_name: Yunzheng
full_name: Le, Yunzheng
last_name: Le
- first_name: Hans
full_name: Fehling, Hans J
last_name: Fehling
- first_name: Dimos
full_name: Gaidatzis, Dimos
last_name: Gaidatzis
- first_name: Michael
full_name: Stadler, Michael B
last_name: Stadler
- first_name: Botond
full_name: Roska, Botond M
last_name: Roska
citation:
ama: Siegert S, Cabuy E, Scherf B, et al. Transcriptional code and disease map for
adult retinal cell types. Nature Neuroscience. 2012;15(3):487-495. doi:10.1038/nn.3032
apa: Siegert, S., Cabuy, E., Scherf, B., Kohler, H., Panda, S., Le, Y., … Roska,
B. (2012). Transcriptional code and disease map for adult retinal cell types.
Nature Neuroscience. Nature Publishing Group. https://doi.org/10.1038/nn.3032
chicago: Siegert, Sandra, Erik Cabuy, Brigitte Scherf, Hubertus Kohler, Satchidananda
Panda, Yunzheng Le, Hans Fehling, Dimos Gaidatzis, Michael Stadler, and Botond
Roska. “Transcriptional Code and Disease Map for Adult Retinal Cell Types.” Nature
Neuroscience. Nature Publishing Group, 2012. https://doi.org/10.1038/nn.3032.
ieee: S. Siegert et al., “Transcriptional code and disease map for adult
retinal cell types,” Nature Neuroscience, vol. 15, no. 3. Nature Publishing
Group, pp. 487–495, 2012.
ista: Siegert S, Cabuy E, Scherf B, Kohler H, Panda S, Le Y, Fehling H, Gaidatzis
D, Stadler M, Roska B. 2012. Transcriptional code and disease map for adult retinal
cell types. Nature Neuroscience. 15(3), 487–495.
mla: Siegert, Sandra, et al. “Transcriptional Code and Disease Map for Adult Retinal
Cell Types.” Nature Neuroscience, vol. 15, no. 3, Nature Publishing Group,
2012, pp. 487–95, doi:10.1038/nn.3032.
short: S. Siegert, E. Cabuy, B. Scherf, H. Kohler, S. Panda, Y. Le, H. Fehling,
D. Gaidatzis, M. Stadler, B. Roska, Nature Neuroscience 15 (2012) 487–495.
date_created: 2018-12-11T11:54:05Z
date_published: 2012-03-01T00:00:00Z
date_updated: 2021-01-12T06:53:17Z
day: '01'
doi: 10.1038/nn.3032
extern: 1
intvolume: ' 15'
issue: '3'
month: '03'
page: 487 - 495
publication: Nature Neuroscience
publication_status: published
publisher: Nature Publishing Group
publist_id: '5309'
quality_controlled: 0
status: public
title: Transcriptional code and disease map for adult retinal cell types
type: journal_article
volume: 15
year: '2012'
...
---
OA_type: closed access
_id: '18010'
abstract:
- lang: eng
text: Electronic factors in molecules such as quantum interference and cross-conjugation
can lead to dramatic modulation and suppression of conductance in single-molecule
junctions. Probing such effects at the single-molecule level requires simultaneous
measurements of independent junction properties, as conductance alone cannot provide
conclusive evidence of junction formation for molecules with low conductivity.
Here, we compare the mechanics of the conducting para-terminated 4,4′-di(methylthio)stilbene
and moderately conducting 1,2-bis(4-(methylthio)phenyl)ethane to that of insulating
meta-terminated 3,3′-di(methylthio)stilbene single-molecule junctions. We simultaneously
measure force and conductance across single-molecule junctions and use force signatures
to obtain independent evidence of junction formation and rupture in the meta-linked
cross-conjugated molecule even when no clear low-bias conductance is measured.
By separately quantifying conductance and mechanics, we identify the formation
of atypical 3,3′-di(methylthio)stilbene molecular junctions that are mechanically
stable but electronically decoupled. While theoretical studies have envisaged
many plausible systems where quantum interference might be observed, our experiments
provide the first direct quantitative study of the interplay between contact mechanics
and the distinctively quantum mechanical nature of electronic transport in single-molecule
junctions.
article_processing_charge: No
article_type: letter_note
author:
- first_name: Sriharsha V.
full_name: Aradhya, Sriharsha V.
last_name: Aradhya
- first_name: Jeffrey S.
full_name: Meisner, Jeffrey S.
last_name: Meisner
- first_name: Markrete
full_name: Krikorian, Markrete
last_name: Krikorian
- first_name: Seokhoon
full_name: Ahn, Seokhoon
last_name: Ahn
- first_name: Radha
full_name: Parameswaran, Radha
last_name: Parameswaran
- first_name: Michael L.
full_name: Steigerwald, Michael L.
last_name: Steigerwald
- first_name: Colin
full_name: Nuckolls, Colin
last_name: Nuckolls
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
citation:
ama: Aradhya SV, Meisner JS, Krikorian M, et al. Dissecting contact mechanics from
quantum interference in single-molecule junctions of stilbene derivatives. Nano
Letters. 2012;12(3):1643-1647. doi:10.1021/nl2045815
apa: Aradhya, S. V., Meisner, J. S., Krikorian, M., Ahn, S., Parameswaran, R., Steigerwald,
M. L., … Venkataraman, L. (2012). Dissecting contact mechanics from quantum interference
in single-molecule junctions of stilbene derivatives. Nano Letters. American
Chemical Society. https://doi.org/10.1021/nl2045815
chicago: Aradhya, Sriharsha V., Jeffrey S. Meisner, Markrete Krikorian, Seokhoon
Ahn, Radha Parameswaran, Michael L. Steigerwald, Colin Nuckolls, and Latha Venkataraman.
“Dissecting Contact Mechanics from Quantum Interference in Single-Molecule Junctions
of Stilbene Derivatives.” Nano Letters. American Chemical Society, 2012.
https://doi.org/10.1021/nl2045815.
ieee: S. V. Aradhya et al., “Dissecting contact mechanics from quantum interference
in single-molecule junctions of stilbene derivatives,” Nano Letters, vol.
12, no. 3. American Chemical Society, pp. 1643–1647, 2012.
ista: Aradhya SV, Meisner JS, Krikorian M, Ahn S, Parameswaran R, Steigerwald ML,
Nuckolls C, Venkataraman L. 2012. Dissecting contact mechanics from quantum interference
in single-molecule junctions of stilbene derivatives. Nano Letters. 12(3), 1643–1647.
mla: Aradhya, Sriharsha V., et al. “Dissecting Contact Mechanics from Quantum Interference
in Single-Molecule Junctions of Stilbene Derivatives.” Nano Letters, vol.
12, no. 3, American Chemical Society, 2012, pp. 1643–47, doi:10.1021/nl2045815.
short: S.V. Aradhya, J.S. Meisner, M. Krikorian, S. Ahn, R. Parameswaran, M.L. Steigerwald,
C. Nuckolls, L. Venkataraman, Nano Letters 12 (2012) 1643–1647.
date_created: 2024-09-09T12:30:36Z
date_published: 2012-02-21T00:00:00Z
date_updated: 2025-01-03T09:18:13Z
day: '21'
doi: 10.1021/nl2045815
extern: '1'
external_id:
pmid:
- '22352939'
intvolume: ' 12'
issue: '3'
language:
- iso: eng
month: '02'
oa_version: None
page: 1643-1647
pmid: 1
publication: Nano Letters
publication_identifier:
eissn:
- 1530-6992
issn:
- 1530-6984
publication_status: published
publisher: American Chemical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Dissecting contact mechanics from quantum interference in single-molecule junctions
of stilbene derivatives
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 12
year: '2012'
...
---
OA_type: closed access
_id: '18011'
abstract:
- lang: eng
text: We use a modified conducting atomic force microscope to simultaneously probe
the conductance of a single-molecule junction and the force required to rupture
the junction formed by alkanes terminated with four different chemical link groups
which vary in binding strength and mechanism to the gold electrodes. Molecular
junctions with amine, methylsulfide, and diphenylphosphine terminated molecules
show clear conductance signatures and rupture at a force that is significantly
smaller than the measured 1.4 nN force required to rupture the single-atomic gold
contact. In contrast, measurements with a thiol terminated alkane which can bind
covalently to the gold electrode show conductance and force features unlike those
of the other molecules studied. Specifically, the strong Au–S bond can cause structural
rearrangements in the electrodes, which are accompanied by substantial conductance
changes. Despite the strong Au–S bond and the evidence for disruption of the Au
structure, the experiments show that on average these junctions also rupture at
a smaller force than that measured for pristine single-atom gold contacts.
article_processing_charge: No
article_type: letter_note
author:
- first_name: Michael
full_name: Frei, Michael
last_name: Frei
- first_name: Sriharsha V.
full_name: Aradhya, Sriharsha V.
last_name: Aradhya
- first_name: Mark S.
full_name: Hybertsen, Mark S.
last_name: Hybertsen
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
citation:
ama: Frei M, Aradhya SV, Hybertsen MS, Venkataraman L. Linker dependent bond rupture
force measurements in single-molecule junctions. Journal of the American Chemical
Society. 2012;134(9):4003-4006. doi:10.1021/ja211590d
apa: Frei, M., Aradhya, S. V., Hybertsen, M. S., & Venkataraman, L. (2012).
Linker dependent bond rupture force measurements in single-molecule junctions.
Journal of the American Chemical Society. American Chemical Society. https://doi.org/10.1021/ja211590d
chicago: Frei, Michael, Sriharsha V. Aradhya, Mark S. Hybertsen, and Latha Venkataraman.
“Linker Dependent Bond Rupture Force Measurements in Single-Molecule Junctions.”
Journal of the American Chemical Society. American Chemical Society, 2012.
https://doi.org/10.1021/ja211590d.
ieee: M. Frei, S. V. Aradhya, M. S. Hybertsen, and L. Venkataraman, “Linker dependent
bond rupture force measurements in single-molecule junctions,” Journal of the
American Chemical Society, vol. 134, no. 9. American Chemical Society, pp.
4003–4006, 2012.
ista: Frei M, Aradhya SV, Hybertsen MS, Venkataraman L. 2012. Linker dependent bond
rupture force measurements in single-molecule junctions. Journal of the American
Chemical Society. 134(9), 4003–4006.
mla: Frei, Michael, et al. “Linker Dependent Bond Rupture Force Measurements in
Single-Molecule Junctions.” Journal of the American Chemical Society, vol.
134, no. 9, American Chemical Society, 2012, pp. 4003–06, doi:10.1021/ja211590d.
short: M. Frei, S.V. Aradhya, M.S. Hybertsen, L. Venkataraman, Journal of the American
Chemical Society 134 (2012) 4003–4006.
date_created: 2024-09-09T12:31:14Z
date_published: 2012-02-16T00:00:00Z
date_updated: 2025-01-03T09:24:29Z
day: '16'
doi: 10.1021/ja211590d
extern: '1'
external_id:
pmid:
- '22338625'
intvolume: ' 134'
issue: '9'
language:
- iso: eng
month: '02'
oa_version: None
page: 4003-4006
pmid: 1
publication: Journal of the American Chemical Society
publication_identifier:
eissn:
- 1520-5126
issn:
- 0002-7863
publication_status: published
publisher: American Chemical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Linker dependent bond rupture force measurements in single-molecule junctions
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 134
year: '2012'
...
---
OA_type: closed access
_id: '18013'
abstract:
- lang: eng
text: Van der Waals (vdW) interaction, and its subtle interplay with chemically
specific interactions and surface roughness at metal/organic interfaces, is critical
to the understanding of structure–function relations in diverse areas, including
catalysis, molecular electronics and self-assembly1,2,3. However, vdW interactions
remain challenging to characterize directly at the fundamental, single-molecule
level both in experiments and in first principles calculations with accurate treatment
of the non-local, London dispersion interactions. In particular, for metal/organic
interfaces, efforts so far have largely focused on model systems consisting of
adsorbed molecules on flat metallic surfaces with minimal specific chemical interaction4,5,6,7,8,9.
Here we show, through measurements of single-molecule mechanics, that pyridine
derivatives10,11 can bind to nanostructured Au electrodes through an additional
binding mechanism beyond the chemically specific N–Au donor–acceptor bond. Using
density functional theory simulations we show that vdW interactions between the
pyridine ring and Au electrodes can play a key role in the junction mechanics.
These measurements thus provide a quantitative characterization of vdW interactions
at metal/organic interfaces at the single-molecule level.
article_processing_charge: No
article_type: letter_note
author:
- first_name: Sriharsha V.
full_name: Aradhya, Sriharsha V.
last_name: Aradhya
- first_name: Michael
full_name: Frei, Michael
last_name: Frei
- first_name: Mark S.
full_name: Hybertsen, Mark S.
last_name: Hybertsen
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
citation:
ama: Aradhya SV, Frei M, Hybertsen MS, Venkataraman L. Van der Waals interactions
at metal/organic interfaces at the single-molecule level. Nature Materials.
2012;11(10):872-876. doi:10.1038/nmat3403
apa: Aradhya, S. V., Frei, M., Hybertsen, M. S., & Venkataraman, L. (2012).
Van der Waals interactions at metal/organic interfaces at the single-molecule
level. Nature Materials. Springer Nature. https://doi.org/10.1038/nmat3403
chicago: Aradhya, Sriharsha V., Michael Frei, Mark S. Hybertsen, and Latha Venkataraman.
“Van Der Waals Interactions at Metal/Organic Interfaces at the Single-Molecule
Level.” Nature Materials. Springer Nature, 2012. https://doi.org/10.1038/nmat3403.
ieee: S. V. Aradhya, M. Frei, M. S. Hybertsen, and L. Venkataraman, “Van der Waals
interactions at metal/organic interfaces at the single-molecule level,” Nature
Materials, vol. 11, no. 10. Springer Nature, pp. 872–876, 2012.
ista: Aradhya SV, Frei M, Hybertsen MS, Venkataraman L. 2012. Van der Waals interactions
at metal/organic interfaces at the single-molecule level. Nature Materials. 11(10),
872–876.
mla: Aradhya, Sriharsha V., et al. “Van Der Waals Interactions at Metal/Organic
Interfaces at the Single-Molecule Level.” Nature Materials, vol. 11, no.
10, Springer Nature, 2012, pp. 872–76, doi:10.1038/nmat3403.
short: S.V. Aradhya, M. Frei, M.S. Hybertsen, L. Venkataraman, Nature Materials
11 (2012) 872–876.
date_created: 2024-09-09T12:32:57Z
date_published: 2012-08-12T00:00:00Z
date_updated: 2025-01-03T09:28:27Z
day: '12'
doi: 10.1038/nmat3403
extern: '1'
external_id:
pmid:
- '22886066'
intvolume: ' 11'
issue: '10'
language:
- iso: eng
month: '08'
oa_version: None
page: 872-876
pmid: 1
publication: Nature Materials
publication_identifier:
eissn:
- 1476-4660
issn:
- 1476-1122
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Van der Waals interactions at metal/organic interfaces at the single-molecule
level
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 11
year: '2012'
...
---
_id: '18201'
abstract:
- lang: eng
text: Owing to thermal fluctuations, two-dimensional (2D) systems cannot undergo
a conventional phase transition associated with the breaking of a continuous symmetry1.
Nevertheless they may exhibit a phase transition to a state with quasi-long-range
order via the Berezinskii–Kosterlitz–Thouless (BKT) mechanism2. A paradigm example
is the 2D Bose fluid, such as a liquid helium film3, which cannot condense at
non-zero temperature although it becomes superfluid above a critical phase space
density. The quasi-long-range coherence and the microscopic nature of the BKT
transition were recently explored with ultracold atomic gases4,5,6. However, a
direct observation of superfluidity in terms of frictionless flow is still missing
for these systems. Here we probe the superfluidity of a 2D trapped Bose gas using
a moving obstacle formed by a micrometre-sized laser beam. We find a dramatic
variation of the response of the fluid, depending on its degree of degeneracy
at the obstacle location.
article_processing_charge: No
article_type: letter_note
arxiv: 1
author:
- first_name: Rémi
full_name: Desbuquois, Rémi
last_name: Desbuquois
- first_name: Lauriane
full_name: Chomaz, Lauriane
last_name: Chomaz
- first_name: Tarik
full_name: Yefsah, Tarik
last_name: Yefsah
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
- first_name: Jérôme
full_name: Beugnon, Jérôme
last_name: Beugnon
- first_name: Christof
full_name: Weitenberg, Christof
last_name: Weitenberg
- first_name: Jean
full_name: Dalibard, Jean
last_name: Dalibard
citation:
ama: Desbuquois R, Chomaz L, Yefsah T, et al. Superfluid behaviour of a two-dimensional
Bose gas. Nature Physics. 2012;8(9):645-648. doi:10.1038/nphys2378
apa: Desbuquois, R., Chomaz, L., Yefsah, T., Leonard, J., Beugnon, J., Weitenberg,
C., & Dalibard, J. (2012). Superfluid behaviour of a two-dimensional Bose
gas. Nature Physics. Springer Nature. https://doi.org/10.1038/nphys2378
chicago: Desbuquois, Rémi, Lauriane Chomaz, Tarik Yefsah, Julian Leonard, Jérôme
Beugnon, Christof Weitenberg, and Jean Dalibard. “Superfluid Behaviour of a Two-Dimensional
Bose Gas.” Nature Physics. Springer Nature, 2012. https://doi.org/10.1038/nphys2378.
ieee: R. Desbuquois et al., “Superfluid behaviour of a two-dimensional Bose
gas,” Nature Physics, vol. 8, no. 9. Springer Nature, pp. 645–648, 2012.
ista: Desbuquois R, Chomaz L, Yefsah T, Leonard J, Beugnon J, Weitenberg C, Dalibard
J. 2012. Superfluid behaviour of a two-dimensional Bose gas. Nature Physics. 8(9),
645–648.
mla: Desbuquois, Rémi, et al. “Superfluid Behaviour of a Two-Dimensional Bose Gas.”
Nature Physics, vol. 8, no. 9, Springer Nature, 2012, pp. 645–48, doi:10.1038/nphys2378.
short: R. Desbuquois, L. Chomaz, T. Yefsah, J. Leonard, J. Beugnon, C. Weitenberg,
J. Dalibard, Nature Physics 8 (2012) 645–648.
date_created: 2024-10-07T11:50:19Z
date_published: 2012-07-29T00:00:00Z
date_updated: 2024-10-07T12:05:22Z
day: '29'
doi: 10.1038/nphys2378
extern: '1'
external_id:
arxiv:
- '1205.4536'
intvolume: ' 8'
issue: '9'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1205.4536
month: '07'
oa: 1
oa_version: Preprint
page: 645-648
publication: Nature Physics
publication_identifier:
eissn:
- 1745-2481
issn:
- 1745-2473
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Superfluid behaviour of a two-dimensional Bose gas
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 8
year: '2012'
...