---
_id: '176'
abstract:
- lang: eng
text: For a general class of non-negative functions defined on integral ideals of
number fields, upper bounds are established for their average over the values
of certain principal ideals that are associated to irreducible binary forms with
integer coefficients.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Timothy D
full_name: Browning, Timothy D
id: 35827D50-F248-11E8-B48F-1D18A9856A87
last_name: Browning
orcid: 0000-0002-8314-0177
- first_name: Efthymios
full_name: Sofos, Efthymios
last_name: Sofos
citation:
ama: Browning TD, Sofos E. Averages of arithmetic functions over principal ideals.
International Journal of Nuber Theory. 2018;15(3):547-567. doi:10.1142/S1793042119500283
apa: Browning, T. D., & Sofos, E. (2018). Averages of arithmetic functions over
principal ideals. International Journal of Nuber Theory. World Scientific
Publishing. https://doi.org/10.1142/S1793042119500283
chicago: Browning, Timothy D, and Efthymios Sofos. “Averages of Arithmetic Functions
over Principal Ideals.” International Journal of Nuber Theory. World Scientific
Publishing, 2018. https://doi.org/10.1142/S1793042119500283.
ieee: T. D. Browning and E. Sofos, “Averages of arithmetic functions over principal
ideals,” International Journal of Nuber Theory, vol. 15, no. 3. World Scientific
Publishing, pp. 547–567, 2018.
ista: Browning TD, Sofos E. 2018. Averages of arithmetic functions over principal
ideals. International Journal of Nuber Theory. 15(3), 547–567.
mla: Browning, Timothy D., and Efthymios Sofos. “Averages of Arithmetic Functions
over Principal Ideals.” International Journal of Nuber Theory, vol. 15,
no. 3, World Scientific Publishing, 2018, pp. 547–67, doi:10.1142/S1793042119500283.
short: T.D. Browning, E. Sofos, International Journal of Nuber Theory 15 (2018)
547–567.
date_created: 2018-12-11T11:45:01Z
date_published: 2018-11-16T00:00:00Z
date_updated: 2021-01-12T06:53:01Z
day: '16'
doi: 10.1142/S1793042119500283
extern: '1'
external_id:
arxiv:
- '1706.04331'
fulldoi: https://doi.org/10.1142/S1793042119500283
intvolume: ' 15'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1706.04331
month: '11'
oa: 1
oa_version: Preprint
page: 547-567
publication: International Journal of Nuber Theory
publication_status: published
publisher: World Scientific Publishing
status: public
title: Averages of arithmetic functions over principal ideals
type: journal_article
user_id: D865714E-FA4E-11E9-B85B-F5C5E5697425
volume: 15
year: '2018'
...
---
_id: '17612'
abstract:
- lang: eng
text: The gravitational waves (GWs) from a binary black hole with masses 10^4≲ M≲
10^7M_⊙ can be detected with the Laser Interferometer Space Antenna (LISA) once
their orbital frequency exceeds 10^{-4}-10^{-5} Hz. The binary separation at this
stage is a=O(100)Rg (gravitational radius), and the orbital speed is v/c=O(0.1).
I argue that at this stage, the binary will be producing bright electromagnetic
(EM) radiation via gas bound to the individual BHs. Both BHs will have their own
photospheres in X-ray and possibly also in optical bands. Relativistic Doppler
modulations and lensing effects will inevitably imprint periodic variability in
the EM light-curve, tracking the phase of the orbital motion, and serving as a
template for the GW inspiral waveform. Advanced localization of the source by
LISA weeks to months prior to merger will enable a measurement of this EM chirp
by wide-field X-ray or optical instruments. A comparison of the phases of the
GW and EM chirp signals will help break degeneracies between system parameters,
and probe a fractional difference difference Δ v in the propagation speed of photons
and gravitons as low as Δ v/c ≈ 10^{-17}.
alternative_title:
- A Phase Template for the Gravitational Wave Inspiral
article_processing_charge: No
article_type: original
author:
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
citation:
ama: Haiman Z. The X-ray chirp of a compact black hole binary. Foundations of
Physics. 2018;48(10):1430-1445. doi:10.1007/s10701-018-0201-0
apa: Haiman, Z. (2018). The X-ray chirp of a compact black hole binary. Foundations
of Physics. Springer Science and Business Media LLC. https://doi.org/10.1007/s10701-018-0201-0
chicago: Haiman, Zoltán. “The X-Ray Chirp of a Compact Black Hole Binary.” Foundations
of Physics. Springer Science and Business Media LLC, 2018. https://doi.org/10.1007/s10701-018-0201-0.
ieee: Z. Haiman, “The X-ray chirp of a compact black hole binary,” Foundations
of Physics, vol. 48, no. 10. Springer Science and Business Media LLC, pp.
1430–1445, 2018.
ista: Haiman Z. 2018. The X-ray chirp of a compact black hole binary. Foundations
of Physics. 48(10), 1430–1445.
mla: Haiman, Zoltán. “The X-Ray Chirp of a Compact Black Hole Binary.” Foundations
of Physics, vol. 48, no. 10, Springer Science and Business Media LLC, 2018,
pp. 1430–45, doi:10.1007/s10701-018-0201-0.
short: Z. Haiman, Foundations of Physics 48 (2018) 1430–1445.
date_created: 2024-09-05T13:24:36Z
date_published: 2018-07-31T00:00:00Z
date_updated: 2024-09-24T07:28:50Z
day: '31'
doi: 10.1007/s10701-018-0201-0
extern: '1'
fulldoi: https://doi.org/10.1007/s10701-018-0201-0
intvolume: ' 48'
issue: '10'
language:
- iso: eng
main_file_link:
- url: https://doi.org/10.1007/s10701-018-0201-0
month: '07'
oa_version: None
page: 1430-1445
publication: Foundations of Physics
publication_identifier:
issn:
- 0015-9018
- 1572-9516
publication_status: published
publisher: Springer Science and Business Media LLC
quality_controlled: '1'
scopus_import: '1'
status: public
title: The X-ray chirp of a compact black hole binary
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 48
year: '2018'
...
---
_id: '17619'
abstract:
- lang: eng
text: We present the results of 2D, moving-mesh, viscous hydrodynamical simulations
of an accretion disc around a merging supermassive black hole binary (SMBHB).
The simulation is pseudo-Newtonian, with the BHs modelled as point masses with
a Paczynski–Wiita potential, and includes viscous heating, shock heating, and
radiative cooling. We follow the gravitational inspiral of an equal-mass binary
with a component mass Mbh = 106 M⊙ from an initial separation of 60rg (where rg
≡ GMbh/c2 is the gravitational radius) to the merger. We find that a central,
low-density cavity forms around the binary, as in previous work, but that the
BHs capture gas from the circumbinary disc and accrete efficiently via their own
minidiscs, well after their inspiral outpaces the viscous evolution of the disc.
The system remains luminous, displaying strong periodicity at twice the binary
orbital frequency throughout the entire inspiral process, all the way to the merger.
In the soft X-ray band, the thermal emission is dominated by the inner edge of
the circumbinary disc with especially clear periodicity in the early inspiral.
By comparison, harder X-ray emission is dominated by the minidiscs, and the light
curve is initially more noisy but develops a clear periodicity in the late inspiral
stage. This variability pattern should help identify the electromagnetic counterparts
of SMBHBs detected by the space-based gravitational-wave detector LISA.
article_processing_charge: No
article_type: original
author:
- first_name: Yike
full_name: Tang, Yike
last_name: Tang
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
- first_name: Andrew
full_name: MacFadyen, Andrew
last_name: MacFadyen
citation:
ama: Tang Y, Haiman Z, MacFadyen A. The late inspiral of supermassive black hole
binaries with circumbinary gas discs in the LISA band. Monthly Notices of the
Royal Astronomical Society. 2018;476(2):2249-2257. doi:10.1093/mnras/sty423
apa: Tang, Y., Haiman, Z., & MacFadyen, A. (2018). The late inspiral of supermassive
black hole binaries with circumbinary gas discs in the LISA band. Monthly Notices
of the Royal Astronomical Society. Oxford University Press. https://doi.org/10.1093/mnras/sty423
chicago: Tang, Yike, Zoltán Haiman, and Andrew MacFadyen. “The Late Inspiral of
Supermassive Black Hole Binaries with Circumbinary Gas Discs in the LISA Band.”
Monthly Notices of the Royal Astronomical Society. Oxford University Press,
2018. https://doi.org/10.1093/mnras/sty423.
ieee: Y. Tang, Z. Haiman, and A. MacFadyen, “The late inspiral of supermassive black
hole binaries with circumbinary gas discs in the LISA band,” Monthly Notices
of the Royal Astronomical Society, vol. 476, no. 2. Oxford University Press,
pp. 2249–2257, 2018.
ista: Tang Y, Haiman Z, MacFadyen A. 2018. The late inspiral of supermassive black
hole binaries with circumbinary gas discs in the LISA band. Monthly Notices of
the Royal Astronomical Society. 476(2), 2249–2257.
mla: Tang, Yike, et al. “The Late Inspiral of Supermassive Black Hole Binaries with
Circumbinary Gas Discs in the LISA Band.” Monthly Notices of the Royal Astronomical
Society, vol. 476, no. 2, Oxford University Press, 2018, pp. 2249–57, doi:10.1093/mnras/sty423.
short: Y. Tang, Z. Haiman, A. MacFadyen, Monthly Notices of the Royal Astronomical
Society 476 (2018) 2249–2257.
date_created: 2024-09-05T13:47:09Z
date_published: 2018-02-19T00:00:00Z
date_updated: 2024-09-24T08:18:22Z
day: '19'
doi: 10.1093/mnras/sty423
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/sty423
intvolume: ' 476'
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1093/mnras/sty423
month: '02'
oa: 1
oa_version: Published Version
page: 2249-2257
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: The late inspiral of supermassive black hole binaries with circumbinary gas
discs in the LISA band
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 476
year: '2018'
...
---
_id: '17627'
abstract:
- lang: eng
text: Observations of high-redshift quasars indicate that supermassive black holes
(SMBHs) with masses greater than ∼109 M⊙ were assembled within the first billion
years after the Big Bang. It is unclear how such massive black holes (BHs) formed
so early. One possible explanation is that these SMBHs were seeded by "heavy"
direct collapse black holes (DCBHs) with masses of MBH ≈ 105 M⊙, but observations
have not yet confirmed or refuted this scenario. In this Letter, we utilize a
cosmological N-body simulation to demonstrate that before they grow roughly an
order of magnitude in mass, DCBHs will have BH mass to halo mass ratios that are
much higher than expected for BH remnants of Population III (Pop III) stars that
have grown to the same mass (∼106 M⊙). We also show that when Tvir ≈ 104 K halos
(the potential sites of DCBH formation) merge with much larger nearby halos (Mh
> 1010 M⊙), they almost always orbit their larger host halos with a separation
of a few kpc, which is sufficient to be spatially resolved with future X-ray and
infrared telescopes. Thus, we propose that a future X-ray mission such as Lynx,
combined with infrared observations, will be able to distinguish high-redshift
DCBHs from smaller BH seeds due to the unusually high BH mass to stellar mass
ratios of the faintest observed quasars, with inferred BH masses below ∼106 M⊙.
article_number: L9
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Eli
full_name: Visbal, Eli
last_name: Visbal
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
citation:
ama: Visbal E, Haiman Z. Identifying direct collapse black hole seeds through their
small host galaxies. The Astrophysical Journal Letters. 2018;865(1). doi:10.3847/2041-8213/aadf3a
apa: Visbal, E., & Haiman, Z. (2018). Identifying direct collapse black hole
seeds through their small host galaxies. The Astrophysical Journal Letters.
American Astronomical Society. https://doi.org/10.3847/2041-8213/aadf3a
chicago: Visbal, Eli, and Zoltán Haiman. “Identifying Direct Collapse Black Hole
Seeds through Their Small Host Galaxies.” The Astrophysical Journal Letters.
American Astronomical Society, 2018. https://doi.org/10.3847/2041-8213/aadf3a.
ieee: E. Visbal and Z. Haiman, “Identifying direct collapse black hole seeds through
their small host galaxies,” The Astrophysical Journal Letters, vol. 865,
no. 1. American Astronomical Society, 2018.
ista: Visbal E, Haiman Z. 2018. Identifying direct collapse black hole seeds through
their small host galaxies. The Astrophysical Journal Letters. 865(1), L9.
mla: Visbal, Eli, and Zoltán Haiman. “Identifying Direct Collapse Black Hole Seeds
through Their Small Host Galaxies.” The Astrophysical Journal Letters,
vol. 865, no. 1, L9, American Astronomical Society, 2018, doi:10.3847/2041-8213/aadf3a.
short: E. Visbal, Z. Haiman, The Astrophysical Journal Letters 865 (2018).
date_created: 2024-09-05T13:57:07Z
date_published: 2018-09-19T00:00:00Z
date_updated: 2024-09-24T09:07:47Z
day: '19'
doi: 10.3847/2041-8213/aadf3a
extern: '1'
external_id:
arxiv:
- '1809.01754'
fulldoi: https://doi.org/10.3847/2041-8213/aadf3a
intvolume: ' 865'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.1809.01754
month: '09'
oa: 1
oa_version: Preprint
publication: The Astrophysical Journal Letters
publication_identifier:
issn:
- 2041-8205
- 2041-8213
publication_status: published
publisher: American Astronomical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Identifying direct collapse black hole seeds through their small host galaxies
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 865
year: '2018'
...
---
_id: '17640'
abstract:
- lang: eng
text: Gravitational waves (GWs) in the nano-hertz band are great tools for understanding
the cosmological evolution of supermassive black holes (SMBHs) in galactic nuclei.
We consider SMBH binaries in high-z ultra-luminous infrared galaxies (ULIRGs)
as sources of a stochastic GW background (GWB). ULIRGs are likely associated with
gas-rich galaxy mergers containing SMBHs that possibly occur at most once in the
life of galaxies, unlike multiple dry mergers at low redshift. Adopting a well-established
sample of ULIRGs, we study the properties of the GWB due to coalescing binary
SMBHs in these galaxies. Since the ULIRG population peaks at z>1.5, the amplitude
of the GWB is not affected even if BH mergers are delayed by as long as ∼ 10 Gyrs.
Despite the rarity of the high-z ULIRGs, we find a tension with the upper limits
from Pulsar Timing Array (PTA) experiments. This result suggests that if a fraction
fm,gal of ULIRGs are associated with SMBH binaries, then no more than 20fm,gal(λEdd/0.3)5/3(tlife/30
Myr) % of the binary SMBHs in ULIRGs can merge within a Hubble time, for plausible
values of the Eddington ratio of ULIRGs (λEdd) and their lifetime (tlife).
article_number: L36
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Kohei
full_name: Inayoshi, Kohei
last_name: Inayoshi
- first_name: Kohei
full_name: Ichikawa, Kohei
last_name: Ichikawa
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
citation:
ama: Inayoshi K, Ichikawa K, Haiman Z. Gravitational waves from supermassive black
hole binaries in ultraluminous infrared galaxies. The Astrophysical Journal
Letters. 2018;863(2). doi:10.3847/2041-8213/aad8ad
apa: Inayoshi, K., Ichikawa, K., & Haiman, Z. (2018). Gravitational waves from
supermassive black hole binaries in ultraluminous infrared galaxies. The Astrophysical
Journal Letters. American Astronomical Society. https://doi.org/10.3847/2041-8213/aad8ad
chicago: Inayoshi, Kohei, Kohei Ichikawa, and Zoltán Haiman. “Gravitational Waves
from Supermassive Black Hole Binaries in Ultraluminous Infrared Galaxies.” The
Astrophysical Journal Letters. American Astronomical Society, 2018. https://doi.org/10.3847/2041-8213/aad8ad.
ieee: K. Inayoshi, K. Ichikawa, and Z. Haiman, “Gravitational waves from supermassive
black hole binaries in ultraluminous infrared galaxies,” The Astrophysical
Journal Letters, vol. 863, no. 2. American Astronomical Society, 2018.
ista: Inayoshi K, Ichikawa K, Haiman Z. 2018. Gravitational waves from supermassive
black hole binaries in ultraluminous infrared galaxies. The Astrophysical Journal
Letters. 863(2), L36.
mla: Inayoshi, Kohei, et al. “Gravitational Waves from Supermassive Black Hole Binaries
in Ultraluminous Infrared Galaxies.” The Astrophysical Journal Letters,
vol. 863, no. 2, L36, American Astronomical Society, 2018, doi:10.3847/2041-8213/aad8ad.
short: K. Inayoshi, K. Ichikawa, Z. Haiman, The Astrophysical Journal Letters 863
(2018).
date_created: 2024-09-06T07:18:03Z
date_published: 2018-08-20T00:00:00Z
date_updated: 2024-09-24T11:47:28Z
day: '20'
doi: 10.3847/2041-8213/aad8ad
extern: '1'
external_id:
arxiv:
- '1805.05334'
fulldoi: https://doi.org/10.3847/2041-8213/aad8ad
intvolume: ' 863'
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.1805.05334
month: '08'
oa: 1
oa_version: Preprint
publication: The Astrophysical Journal Letters
publication_identifier:
issn:
- 2041-8205
- 2041-8213
publication_status: published
publisher: American Astronomical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Gravitational waves from supermassive black hole binaries in ultraluminous
infrared galaxies
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 863
year: '2018'
...
---
_id: '17655'
abstract:
- lang: eng
text: We have developed a semi-analytic framework to model the large-scale evolution
of the first Population III (Pop III) stars and the transition to metal-enriched
star formation. Our model follows dark matter haloes from cosmological N-body
simulations, utilizing their individual merger histories and three-dimensional
positions, and applies physically motivated prescriptions for star formation and
feedback from Lyman–Werner (LW) radiation, hydrogen ionizing radiation, and external
metal enrichment due to supernovae winds. This method is intended to complement
analytic studies, which do not include clustering or individual merger histories,
and hydrodynamical cosmological simulations, which include detailed physics, but
are computationally expensive and have limited dynamic range. Utilizing this technique,
we compute the cumulative Pop III and metal-enriched star formation rate density
(SFRD) as a function of redshift at z ≥ 20. We find that varying the model parameters
leads to significant qualitative changes in the global star formation history.
The Pop III star formation efficiency and the delay time between Pop III and subsequent
metal-enriched star formation are found to have the largest impact. The effect
of clustering (i.e. including the three-dimensional positions of individual haloes)
on various feedback mechanisms is also investigated. The impact of clustering
on LW and ionization feedback is found to be relatively mild in our fiducial model,
but can be larger if external metal enrichment can promote metal-enriched star
formation over large distances.
article_processing_charge: No
article_type: original
author:
- first_name: Eli
full_name: Visbal, Eli
last_name: Visbal
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
- first_name: Greg L
full_name: Bryan, Greg L
last_name: Bryan
citation:
ama: Visbal E, Haiman Z, Bryan GL. Self-consistent semi-analytic models of the first
stars. Monthly Notices of the Royal Astronomical Society. 2018;475(4):5246-5256.
doi:10.1093/mnras/sty142
apa: Visbal, E., Haiman, Z., & Bryan, G. L. (2018). Self-consistent semi-analytic
models of the first stars. Monthly Notices of the Royal Astronomical Society.
Oxford University Press. https://doi.org/10.1093/mnras/sty142
chicago: Visbal, Eli, Zoltán Haiman, and Greg L Bryan. “Self-Consistent Semi-Analytic
Models of the First Stars.” Monthly Notices of the Royal Astronomical Society.
Oxford University Press, 2018. https://doi.org/10.1093/mnras/sty142.
ieee: E. Visbal, Z. Haiman, and G. L. Bryan, “Self-consistent semi-analytic models
of the first stars,” Monthly Notices of the Royal Astronomical Society,
vol. 475, no. 4. Oxford University Press, pp. 5246–5256, 2018.
ista: Visbal E, Haiman Z, Bryan GL. 2018. Self-consistent semi-analytic models of
the first stars. Monthly Notices of the Royal Astronomical Society. 475(4), 5246–5256.
mla: Visbal, Eli, et al. “Self-Consistent Semi-Analytic Models of the First Stars.”
Monthly Notices of the Royal Astronomical Society, vol. 475, no. 4, Oxford
University Press, 2018, pp. 5246–56, doi:10.1093/mnras/sty142.
short: E. Visbal, Z. Haiman, G.L. Bryan, Monthly Notices of the Royal Astronomical
Society 475 (2018) 5246–5256.
date_created: 2024-09-06T07:33:13Z
date_published: 2018-01-17T00:00:00Z
date_updated: 2024-09-24T14:23:23Z
day: '17'
doi: 10.1093/mnras/sty142
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/sty142
intvolume: ' 475'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1093/mnras/sty142
month: '01'
oa: 1
oa_version: Published Version
page: 5246-5256
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: Self-consistent semi-analytic models of the first stars
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 475
year: '2018'
...
---
_id: '17662'
abstract:
- lang: eng
text: Weak lensing maps contain information beyond two-point statistics on small
scales. Much recent work has tried to extract this information through a range
of different observables or via nonlinear transformations of the lensing field.
Here we train and apply a 2D convolutional neural network to simulated noiseless
lensing maps covering 96 different cosmological models over a range of {Ωm,σ8}.
Using the area of the confidence contour in the {Ωm,σ8} plane as a figure-of-merit,
derived from simulated convergence maps smoothed on a scale of 1.0 arcmin, we
show that the neural network yields ≈5× tighter constraints than the power spectrum,
and ≈4× tighter than the lensing peaks. Such gains illustrate the extent to which
weak lensing data encode cosmological information not accessible to the power
spectrum or even other, non-Gaussian statistics such as lensing peaks.
article_number: '103515'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Arushi
full_name: Gupta, Arushi
last_name: Gupta
- first_name: José Manuel Zorrilla
full_name: Matilla, José Manuel Zorrilla
last_name: Matilla
- first_name: Daniel
full_name: Hsu, Daniel
last_name: Hsu
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
citation:
ama: Gupta A, Matilla JMZ, Hsu D, Haiman Z. Non-Gaussian information from weak lensing
data via deep learning. Physical Review D. 2018;97(10). doi:10.1103/physrevd.97.103515
apa: Gupta, A., Matilla, J. M. Z., Hsu, D., & Haiman, Z. (2018). Non-Gaussian
information from weak lensing data via deep learning. Physical Review D.
American Physical Society. https://doi.org/10.1103/physrevd.97.103515
chicago: Gupta, Arushi, José Manuel Zorrilla Matilla, Daniel Hsu, and Zoltán Haiman.
“Non-Gaussian Information from Weak Lensing Data via Deep Learning.” Physical
Review D. American Physical Society, 2018. https://doi.org/10.1103/physrevd.97.103515.
ieee: A. Gupta, J. M. Z. Matilla, D. Hsu, and Z. Haiman, “Non-Gaussian information
from weak lensing data via deep learning,” Physical Review D, vol. 97,
no. 10. American Physical Society, 2018.
ista: Gupta A, Matilla JMZ, Hsu D, Haiman Z. 2018. Non-Gaussian information from
weak lensing data via deep learning. Physical Review D. 97(10), 103515.
mla: Gupta, Arushi, et al. “Non-Gaussian Information from Weak Lensing Data via
Deep Learning.” Physical Review D, vol. 97, no. 10, 103515, American Physical
Society, 2018, doi:10.1103/physrevd.97.103515.
short: A. Gupta, J.M.Z. Matilla, D. Hsu, Z. Haiman, Physical Review D 97 (2018).
date_created: 2024-09-06T07:39:50Z
date_published: 2018-05-18T00:00:00Z
date_updated: 2024-09-25T07:28:42Z
day: '18'
doi: 10.1103/physrevd.97.103515
extern: '1'
external_id:
arxiv:
- '1802.01212'
fulldoi: https://doi.org/10.1103/physrevd.97.103515
intvolume: ' 97'
issue: '10'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.1802.01212'
month: '05'
oa: 1
oa_version: Preprint
publication: Physical Review D
publication_identifier:
issn:
- 2470-0010
- 2470-0029
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Non-Gaussian information from weak lensing data via deep learning
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 97
year: '2018'
...
---
_id: '17679'
abstract:
- lang: eng
text: We study low-density axisymmetric accretion flows onto black holes (BHs) with
two-dimensional hydrodynamical simulations, adopting the α-viscosity prescription.
When the gas angular momentum is low enough to form a rotationally supported disk
within the Bondi radius (RB), we find a global steady accretion solution. The
solution consists of a rotational equilibrium distribution at r∼RB, where the
density follows ρ∝(1+RB/r)^3/2, surrounding a geometrically thick and optically
thin accretion disk at the centrifugal radius, where thermal energy generated
by viscosity is transported via strong convection. Physical properties of the
inner solution agree with those expected in convection-dominated accretion flows
(CDAF; ρ∝r^−1/2). In the inner CDAF solution, the gas inflow rate decreases towards
the center due to convection (M˙∝r), and the net accretion rate (including both
inflows and outflows) is strongly suppressed by several orders of magnitude from
the Bondi accretion rate M˙B The net accretion rate depends on the viscous strength,
following M˙/M˙B∝(α/0.01)^0.6. This solution holds for low accretion rates of
M˙B/M˙Edd<10^−3 having minimal radiation cooling, where M˙Edd is the Eddington
rate. In a hot plasma at the bottom (r<10^−3 RB), thermal conduction would dominate
the convective energy flux. Since suppression of the accretion by convection ceases,
the final BH feeding rate is found to be M˙/M˙B∼10^−3−10^−2. This rate is as low
as M˙/M˙Edd∼10^−7−10^−6 inferred for SgrA∗ and the nuclear BHs in M31 and M87,
and can explain the low luminosities in these sources, without invoking any feedback
mechanism.
article_processing_charge: No
article_type: original
author:
- first_name: Kohei
full_name: Inayoshi, Kohei
last_name: Inayoshi
- first_name: Jeremiah P
full_name: Ostriker, Jeremiah P
last_name: Ostriker
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
- first_name: Rolf
full_name: Kuiper, Rolf
last_name: Kuiper
citation:
ama: Inayoshi K, Ostriker JP, Haiman Z, Kuiper R. Low-density, radiatively inefficient
rotating-accretion flow on to a black hole. Monthly Notices of the Royal Astronomical
Society. 2018;476(1):1412-1426. doi:10.1093/mnras/sty276
apa: Inayoshi, K., Ostriker, J. P., Haiman, Z., & Kuiper, R. (2018). Low-density,
radiatively inefficient rotating-accretion flow on to a black hole. Monthly
Notices of the Royal Astronomical Society. Oxford University Press. https://doi.org/10.1093/mnras/sty276
chicago: Inayoshi, Kohei, Jeremiah P Ostriker, Zoltán Haiman, and Rolf Kuiper. “Low-Density,
Radiatively Inefficient Rotating-Accretion Flow on to a Black Hole.” Monthly
Notices of the Royal Astronomical Society. Oxford University Press, 2018.
https://doi.org/10.1093/mnras/sty276.
ieee: K. Inayoshi, J. P. Ostriker, Z. Haiman, and R. Kuiper, “Low-density, radiatively
inefficient rotating-accretion flow on to a black hole,” Monthly Notices of
the Royal Astronomical Society, vol. 476, no. 1. Oxford University Press,
pp. 1412–1426, 2018.
ista: Inayoshi K, Ostriker JP, Haiman Z, Kuiper R. 2018. Low-density, radiatively
inefficient rotating-accretion flow on to a black hole. Monthly Notices of the
Royal Astronomical Society. 476(1), 1412–1426.
mla: Inayoshi, Kohei, et al. “Low-Density, Radiatively Inefficient Rotating-Accretion
Flow on to a Black Hole.” Monthly Notices of the Royal Astronomical Society,
vol. 476, no. 1, Oxford University Press, 2018, pp. 1412–26, doi:10.1093/mnras/sty276.
short: K. Inayoshi, J.P. Ostriker, Z. Haiman, R. Kuiper, Monthly Notices of the
Royal Astronomical Society 476 (2018) 1412–1426.
date_created: 2024-09-06T08:05:18Z
date_published: 2018-02-01T00:00:00Z
date_updated: 2024-09-25T08:57:35Z
day: '01'
doi: 10.1093/mnras/sty276
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/sty276
intvolume: ' 476'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1093/mnras/sty276
month: '02'
oa: 1
oa_version: Published Version
page: 1412-1426
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: Low-density, radiatively inefficient rotating-accretion flow on to a black
hole
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 476
year: '2018'
...
---
_id: '17680'
abstract:
- lang: eng
text: The advent of time domain astronomy is revolutionizing our understanding of
the universe. Programs such as the Catalina Real-time Transient Survey (CRTS)
or the Palomar Transient Factory (PTF) surveyed millions of objects for several
years, allowing variability studies on large statistical samples. The inspection
of ≈250 k quasars in CRTS resulted in a catalog of 111 potentially periodic sources,
put forward as supermassive black hole binary (SMBHB) candidates. A similar investigation
on PTF data yielded 33 candidates from a sample of ≈35 k quasars. Working under
the SMBHB hypothesis, we compute the implied SMBHB merger rate and we use it to
construct the expected gravitational wave background (GWB) at nano-Hz frequencies,
probed by pulsar timing arrays (PTAs). After correcting for incompleteness and
assuming virial mass estimates, we find that the GWB implied by the CRTS sample
exceeds the current most stringent PTA upper limits by almost an order of magnitude.
After further correcting for the implicit bias in virial mass measurements, the
implied GWB drops significantly but is still in tension with the most stringent
PTA upper limits. Similar results hold for the PTF sample. Bayesian model selection
shows that the null hypothesis (whereby the candidates are false positives) is
preferred over the binary hypothesis at about 2.3σ and 3.6σ for the CRTS and PTF
samples respectively. Although not decisive, our analysis highlights the potential
of PTAs as astrophysical probes of individual SMBHB candidates and indicates that
the CRTS and PTF samples are likely contaminated by several false positives.
article_number: '42'
article_processing_charge: No
article_type: original
author:
- first_name: Alberto
full_name: Sesana, Alberto
last_name: Sesana
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
- first_name: Bence
full_name: Kocsis, Bence
last_name: Kocsis
- first_name: Luke Zoltan
full_name: Kelley, Luke Zoltan
last_name: Kelley
citation:
ama: 'Sesana A, Haiman Z, Kocsis B, Kelley LZ. Testing the binary hypothesis: Pulsar
timing constraints on supermassive black hole binary candidates. The Astrophysical
Journal. 2018;856(1). doi:10.3847/1538-4357/aaad0f'
apa: 'Sesana, A., Haiman, Z., Kocsis, B., & Kelley, L. Z. (2018). Testing the
binary hypothesis: Pulsar timing constraints on supermassive black hole binary
candidates. The Astrophysical Journal. American Astronomical Society. https://doi.org/10.3847/1538-4357/aaad0f'
chicago: 'Sesana, Alberto, Zoltán Haiman, Bence Kocsis, and Luke Zoltan Kelley.
“Testing the Binary Hypothesis: Pulsar Timing Constraints on Supermassive Black
Hole Binary Candidates.” The Astrophysical Journal. American Astronomical
Society, 2018. https://doi.org/10.3847/1538-4357/aaad0f.'
ieee: 'A. Sesana, Z. Haiman, B. Kocsis, and L. Z. Kelley, “Testing the binary hypothesis:
Pulsar timing constraints on supermassive black hole binary candidates,” The
Astrophysical Journal, vol. 856, no. 1. American Astronomical Society, 2018.'
ista: 'Sesana A, Haiman Z, Kocsis B, Kelley LZ. 2018. Testing the binary hypothesis:
Pulsar timing constraints on supermassive black hole binary candidates. The Astrophysical
Journal. 856(1), 42.'
mla: 'Sesana, Alberto, et al. “Testing the Binary Hypothesis: Pulsar Timing Constraints
on Supermassive Black Hole Binary Candidates.” The Astrophysical Journal,
vol. 856, no. 1, 42, American Astronomical Society, 2018, doi:10.3847/1538-4357/aaad0f.'
short: A. Sesana, Z. Haiman, B. Kocsis, L.Z. Kelley, The Astrophysical Journal 856
(2018).
date_created: 2024-09-06T08:06:14Z
date_published: 2018-03-22T00:00:00Z
date_updated: 2024-09-25T09:02:27Z
day: '22'
doi: 10.3847/1538-4357/aaad0f
extern: '1'
fulldoi: https://doi.org/10.3847/1538-4357/aaad0f
intvolume: ' 856'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3847/1538-4357/aaad0f
month: '03'
oa: 1
oa_version: Published Version
publication: The Astrophysical Journal
publication_identifier:
issn:
- 0004-637X
- 1538-4357
publication_status: published
publisher: American Astronomical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Testing the binary hypothesis: Pulsar timing constraints on supermassive black
hole binary candidates'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 856
year: '2018'
...
---
_id: '17687'
abstract:
- lang: eng
text: We propose the formation of massive pristine dark-matter (DM) halos with masses
of ∼10^8 M⊙, due to the dynamical effects of frequent mergers in rare regions
of the Universe with high baryonic streaming velocity relative to DM. Since the
streaming motion prevents gas collapse into DM halos and delays prior star formation
episodes, the gas remains metal-free until the halo virial temperatures ≳2×10^4
K. The minimum cooling mass of DM halos is boosted by a factor of ∼10−30 because
frequent major mergers of halos further inhibit gas collapse. We use Monte Carlo
merger trees to simulate the DM assembly history under a streaming velocity of
twice the root-mean-square value, and estimate the number density of massive DM
halos containing pristine gas as ≃10^−4 cMpc^−3. When the gas infall begins, efficient
Lyα cooling drives cold streams penetrating inside the halo and feeding a central
galactic disk. When one stream collides with the disk, strong shock forms a dense
and hot gas cloud, where the gas never forms H2 molecules due to effective collisional
dissociation. As a result, a massive gas cloud forms by gravitational instability
and collapses directly into a massive black hole (BH) with M∙∼10^5 M⊙. Almost
simultaneously, a galaxy with M⋆,tot∼10^6 M⊙ composed of Population III stars
forms in the nuclear region. If the typical stellar mass is as high as ∼100 M⊙,
the galaxy could be detected with the James Webb Space Telescope even at z≳15.
These massive seed BHs would be fed by continuous gas accretion from the host
galaxy, and grow to be bright quasars observed at z≳6.
article_processing_charge: No
article_type: original
author:
- first_name: Kohei
full_name: Inayoshi, Kohei
last_name: Inayoshi
- first_name: Miao
full_name: Li, Miao
last_name: Li
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
citation:
ama: Inayoshi K, Li M, Haiman Z. Massive black hole and Population III galaxy formation
in overmassive dark-matter haloes with violent merger histories. Monthly Notices
of the Royal Astronomical Society. 2018;479(3):4017-4027. doi:10.1093/mnras/sty1720
apa: Inayoshi, K., Li, M., & Haiman, Z. (2018). Massive black hole and Population
III galaxy formation in overmassive dark-matter haloes with violent merger histories.
Monthly Notices of the Royal Astronomical Society. Oxford University Press.
https://doi.org/10.1093/mnras/sty1720
chicago: Inayoshi, Kohei, Miao Li, and Zoltán Haiman. “Massive Black Hole and Population
III Galaxy Formation in Overmassive Dark-Matter Haloes with Violent Merger Histories.”
Monthly Notices of the Royal Astronomical Society. Oxford University Press,
2018. https://doi.org/10.1093/mnras/sty1720.
ieee: K. Inayoshi, M. Li, and Z. Haiman, “Massive black hole and Population III
galaxy formation in overmassive dark-matter haloes with violent merger histories,”
Monthly Notices of the Royal Astronomical Society, vol. 479, no. 3. Oxford
University Press, pp. 4017–4027, 2018.
ista: Inayoshi K, Li M, Haiman Z. 2018. Massive black hole and Population III galaxy
formation in overmassive dark-matter haloes with violent merger histories. Monthly
Notices of the Royal Astronomical Society. 479(3), 4017–4027.
mla: Inayoshi, Kohei, et al. “Massive Black Hole and Population III Galaxy Formation
in Overmassive Dark-Matter Haloes with Violent Merger Histories.” Monthly Notices
of the Royal Astronomical Society, vol. 479, no. 3, Oxford University Press,
2018, pp. 4017–27, doi:10.1093/mnras/sty1720.
short: K. Inayoshi, M. Li, Z. Haiman, Monthly Notices of the Royal Astronomical
Society 479 (2018) 4017–4027.
date_created: 2024-09-06T08:22:23Z
date_published: 2018-06-30T00:00:00Z
date_updated: 2024-09-25T09:46:30Z
day: '30'
doi: 10.1093/mnras/sty1720
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/sty1720
intvolume: ' 479'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1093/mnras/sty1720
month: '06'
oa: 1
oa_version: Published Version
page: 4017-4027
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: Massive black hole and Population III galaxy formation in overmassive dark-matter
haloes with violent merger histories
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 479
year: '2018'
...
---
_id: '17691'
abstract:
- lang: eng
text: Supermassive black hole binaries (SMBHBs) should be common in galactic nuclei
as a result of frequent galaxy mergers. Recently, a large sample of sub-parsec
SMBHB candidates was identified as bright periodically variable quasars in optical
surveys. If the observed periodicity corresponds to the redshifted binary orbital
period, the inferred orbital velocities are relativistic (v/c ≈ 0.1). The optical
and ultraviolet (UV) luminosities are expected to arise from gas bound to the
individual BHs, and would be modulated by the relativistic Doppler effect. The
optical and UV light curves should vary in tandem with relative amplitudes which
depend on the respective spectral slopes. We constructed a control sample of 42
quasars with aperiodic variability, to test whether this Doppler colour signature
can be distinguished from intrinsic chromatic variability. We found that the Doppler
signature can arise by chance in ∼20 per cent (∼37 per cent) of quasars in the
nUV (fUV) band. These probabilities reflect the limited quality of the control
sample and represent upper limits on how frequently quasars mimic the Doppler
brightness+colour variations. We performed separate tests on the periodic quasar
candidates, and found that for the majority, the Doppler boost hypothesis requires
an unusually steep UV spectrum or an unexpectedly large BH mass and orbital velocity.
We conclude that at most approximately one-third of these periodic candidates
can harbor Doppler-modulated SMBHBs.
article_processing_charge: No
article_type: original
author:
- first_name: Maria
full_name: Charisi, Maria
last_name: Charisi
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
- first_name: David
full_name: Schiminovich, David
last_name: Schiminovich
- first_name: Daniel J
full_name: D'Orazio, Daniel J
last_name: D'Orazio
citation:
ama: Charisi M, Haiman Z, Schiminovich D, D’Orazio DJ. Testing the relativistic
Doppler boost hypothesis for supermassive black hole binary candidates. Monthly
Notices of the Royal Astronomical Society. 2018;476(4):4617-4628. doi:10.1093/mnras/sty516
apa: Charisi, M., Haiman, Z., Schiminovich, D., & D’Orazio, D. J. (2018). Testing
the relativistic Doppler boost hypothesis for supermassive black hole binary candidates.
Monthly Notices of the Royal Astronomical Society. Oxford University Press.
https://doi.org/10.1093/mnras/sty516
chicago: Charisi, Maria, Zoltán Haiman, David Schiminovich, and Daniel J D’Orazio.
“Testing the Relativistic Doppler Boost Hypothesis for Supermassive Black Hole
Binary Candidates.” Monthly Notices of the Royal Astronomical Society.
Oxford University Press, 2018. https://doi.org/10.1093/mnras/sty516.
ieee: M. Charisi, Z. Haiman, D. Schiminovich, and D. J. D’Orazio, “Testing the relativistic
Doppler boost hypothesis for supermassive black hole binary candidates,” Monthly
Notices of the Royal Astronomical Society, vol. 476, no. 4. Oxford University
Press, pp. 4617–4628, 2018.
ista: Charisi M, Haiman Z, Schiminovich D, D’Orazio DJ. 2018. Testing the relativistic
Doppler boost hypothesis for supermassive black hole binary candidates. Monthly
Notices of the Royal Astronomical Society. 476(4), 4617–4628.
mla: Charisi, Maria, et al. “Testing the Relativistic Doppler Boost Hypothesis for
Supermassive Black Hole Binary Candidates.” Monthly Notices of the Royal Astronomical
Society, vol. 476, no. 4, Oxford University Press, 2018, pp. 4617–28, doi:10.1093/mnras/sty516.
short: M. Charisi, Z. Haiman, D. Schiminovich, D.J. D’Orazio, Monthly Notices of
the Royal Astronomical Society 476 (2018) 4617–4628.
date_created: 2024-09-06T08:38:11Z
date_published: 2018-02-28T00:00:00Z
date_updated: 2024-09-25T09:56:16Z
day: '28'
doi: 10.1093/mnras/sty516
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/sty516
intvolume: ' 476'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1093/mnras/sty516
month: '02'
oa: 1
oa_version: Published Version
page: 4617-4628
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: Testing the relativistic Doppler boost hypothesis for supermassive black hole
binary candidates
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 476
year: '2018'
...
---
_id: '17713'
abstract:
- lang: eng
text: 'The non-zero mass of neutrinos suppresses the growth of cosmic structure
on small scales. Since the level of suppression depends on the sum of the masses
of the three active neutrino species, the evolution of large-scale structure is
a promising tool to constrain the total mass of neutrinos and possibly shed light
on the mass hierarchy. In this work, we investigate these effects via a large
suite of N-body simulations that include massive neutrinos using an analytic linear-response
approximation: the Cosmological Massive Neutrino Simulations (MassiveNuS). The
simulations include the effects of radiation on the background expansion, as well
as the clustering of neutrinos in response to the nonlinear dark matter evolution.
We allow three cosmological parameters to vary: the neutrino mass sum M_nu in
the range of 0-0.6 eV, the total matter density Omega_m, and the primordial power
spectrum amplitude A_s. The rms density fluctuation in spheres of 8 comoving Mpc/h
(sigma_8) is a derived parameter as a result. Our data products include N-body
snapshots, halo catalogues, merger trees, ray- traced galaxy lensing convergence
maps for four source redshift planes between z_s=1-2.5, and ray-traced cosmic
microwave background lensing convergence maps. We describe the simulation procedures
and code validation in this paper. The data are publicly available at http://columbialensing.org.'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Jia
full_name: Liu, Jia
last_name: Liu
- first_name: Simeon
full_name: Bird, Simeon
last_name: Bird
- first_name: José Manuel Zorrilla
full_name: Matilla, José Manuel Zorrilla
last_name: Matilla
- first_name: J. Colin
full_name: Hill, J. Colin
last_name: Hill
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
- first_name: Mathew S.
full_name: Madhavacheril, Mathew S.
last_name: Madhavacheril
- first_name: Andrea
full_name: Petri, Andrea
last_name: Petri
- first_name: David N.
full_name: Spergel, David N.
last_name: Spergel
citation:
ama: 'Liu J, Bird S, Matilla JMZ, et al. MassiveNuS: Cosmological massive neutrino
simulations. Journal of Cosmology and Astroparticle Physics. 2018;2018(03):049-049.
doi:10.1088/1475-7516/2018/03/049'
apa: 'Liu, J., Bird, S., Matilla, J. M. Z., Hill, J. C., Haiman, Z., Madhavacheril,
M. S., … Spergel, D. N. (2018). MassiveNuS: Cosmological massive neutrino simulations.
Journal of Cosmology and Astroparticle Physics. IOP Publishing. https://doi.org/10.1088/1475-7516/2018/03/049'
chicago: 'Liu, Jia, Simeon Bird, José Manuel Zorrilla Matilla, J. Colin Hill, Zoltán
Haiman, Mathew S. Madhavacheril, Andrea Petri, and David N. Spergel. “MassiveNuS:
Cosmological Massive Neutrino Simulations.” Journal of Cosmology and Astroparticle
Physics. IOP Publishing, 2018. https://doi.org/10.1088/1475-7516/2018/03/049.'
ieee: 'J. Liu et al., “MassiveNuS: Cosmological massive neutrino simulations,”
Journal of Cosmology and Astroparticle Physics, vol. 2018, no. 03. IOP
Publishing, pp. 049–049, 2018.'
ista: 'Liu J, Bird S, Matilla JMZ, Hill JC, Haiman Z, Madhavacheril MS, Petri A,
Spergel DN. 2018. MassiveNuS: Cosmological massive neutrino simulations. Journal
of Cosmology and Astroparticle Physics. 2018(03), 049–049.'
mla: 'Liu, Jia, et al. “MassiveNuS: Cosmological Massive Neutrino Simulations.”
Journal of Cosmology and Astroparticle Physics, vol. 2018, no. 03, IOP
Publishing, 2018, pp. 049–049, doi:10.1088/1475-7516/2018/03/049.'
short: J. Liu, S. Bird, J.M.Z. Matilla, J.C. Hill, Z. Haiman, M.S. Madhavacheril,
A. Petri, D.N. Spergel, Journal of Cosmology and Astroparticle Physics 2018 (2018)
049–049.
date_created: 2024-09-06T08:57:32Z
date_published: 2018-03-29T00:00:00Z
date_updated: 2024-09-25T12:35:35Z
day: '29'
doi: 10.1088/1475-7516/2018/03/049
extern: '1'
external_id:
arxiv:
- '1711.10524'
fulldoi: https://doi.org/10.1088/1475-7516/2018/03/049
intvolume: ' 2018'
issue: '03'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.1711.10524'
month: '03'
oa: 1
oa_version: Preprint
page: 049-049
publication: Journal of Cosmology and Astroparticle Physics
publication_identifier:
issn:
- 1475-7516
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'MassiveNuS: Cosmological massive neutrino simulations'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 2018
year: '2018'
...
---
_id: '178'
abstract:
- lang: eng
text: We give an upper bound for the number of rational points of height at most
B, lying on a surface defined by a quadratic form Q. The bound shows an explicit
dependence on Q. It is optimal with respect to B, and is also optimal for typical
forms Q.
article_processing_charge: No
arxiv: 1
author:
- first_name: Timothy D
full_name: Browning, Timothy D
id: 35827D50-F248-11E8-B48F-1D18A9856A87
last_name: Browning
orcid: 0000-0002-8314-0177
- first_name: Roger
full_name: Heath-Brown, Roger
last_name: Heath-Brown
citation:
ama: Browning TD, Heath-Brown R. Counting rational points on quadric surfaces. Discrete
Analysis. 2018;15:1-29. doi:10.19086/da.4375
apa: Browning, T. D., & Heath-Brown, R. (2018). Counting rational points on
quadric surfaces. Discrete Analysis. Alliance of Diamond Open Access Journals.
https://doi.org/10.19086/da.4375
chicago: Browning, Timothy D, and Roger Heath-Brown. “Counting Rational Points on
Quadric Surfaces.” Discrete Analysis. Alliance of Diamond Open Access Journals,
2018. https://doi.org/10.19086/da.4375.
ieee: T. D. Browning and R. Heath-Brown, “Counting rational points on quadric surfaces,”
Discrete Analysis, vol. 15. Alliance of Diamond Open Access Journals, pp.
1–29, 2018.
ista: Browning TD, Heath-Brown R. 2018. Counting rational points on quadric surfaces.
Discrete Analysis. 15, 1–29.
mla: Browning, Timothy D., and Roger Heath-Brown. “Counting Rational Points on Quadric
Surfaces.” Discrete Analysis, vol. 15, Alliance of Diamond Open Access
Journals, 2018, pp. 1–29, doi:10.19086/da.4375.
short: T.D. Browning, R. Heath-Brown, Discrete Analysis 15 (2018) 1–29.
date_created: 2018-12-11T11:45:02Z
date_published: 2018-09-07T00:00:00Z
date_updated: 2022-08-26T09:13:02Z
day: '07'
ddc:
- '512'
doi: 10.19086/da.4375
extern: '1'
external_id:
arxiv:
- '1801.00979'
fulldoi: https://doi.org/10.19086/da.4375
intvolume: ' 15'
language:
- iso: eng
license: https://creativecommons.org/licenses/by/4.0/
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1801.00979
month: '09'
oa: 1
oa_version: Preprint
page: 1 - 29
publication: Discrete Analysis
publication_identifier:
eissn:
- 2397-3129
publication_status: published
publisher: Alliance of Diamond Open Access Journals
quality_controlled: '1'
status: public
title: Counting rational points on quadric surfaces
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87
volume: 15
year: '2018'
...
---
OA_type: closed access
_id: '17927'
abstract:
- lang: eng
text: Linear silanes are efficient molecular wires due to strong σ-conjugation in
the transoid conformation; however, the structure–function relationship for the
conformational dependence of the single-molecule conductance of silanes remains
untested. Here we report the syntheses, electrical measurements, and theoretical
characterization of four series of functionalized cyclic and bicyclic silanes
including a cyclotetrasilane, a cyclopentasilane, a bicyclo[2.2.1]heptasilane,
and a bicyclo[2.2.2]octasilane, which are all extended by linear silicon linkers
of varying length. We find an unusual variation of the single-molecule conductance
among the four series at each linker length. We determine the relative conductance
of the (bi)cyclic silicon structures by using the common length dependence of
the four series rather than comparing the conductance at a single length. In contrast
with the cyclic π-conjugated molecules, the conductance of σ-conjugated (bi)cyclic
silanes is dominated by a single path through the molecule and is controlled by
the dihedral angles along this path. This strong sensitivity to molecular conformation
dictates the single-molecule conductance of σ-conjugated silanes and allows for
systematic control of the conductance through molecular design.
article_processing_charge: No
article_type: original
author:
- first_name: Haixing
full_name: Li, Haixing
last_name: Li
- first_name: Marc H.
full_name: Garner, Marc H.
last_name: Garner
- first_name: Zhichun
full_name: Shangguan, Zhichun
last_name: Shangguan
- first_name: Yan
full_name: Chen, Yan
last_name: Chen
- first_name: Qianwen
full_name: Zheng, Qianwen
last_name: Zheng
- first_name: Timothy A.
full_name: Su, Timothy A.
last_name: Su
- first_name: Madhav
full_name: Neupane, Madhav
last_name: Neupane
- first_name: Taifeng
full_name: Liu, Taifeng
last_name: Liu
- first_name: Michael L.
full_name: Steigerwald, Michael L.
last_name: Steigerwald
- first_name: Fay
full_name: Ng, Fay
last_name: Ng
- first_name: Colin
full_name: Nuckolls, Colin
last_name: Nuckolls
- first_name: Shengxiong
full_name: Xiao, Shengxiong
last_name: Xiao
- first_name: Gemma C.
full_name: Solomon, Gemma C.
last_name: Solomon
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
citation:
ama: Li H, Garner MH, Shangguan Z, et al. Large variations in the single-molecule
conductance of cyclic and bicyclic silanes. Journal of the American Chemical
Society. 2018;140(44):15080-15088. doi:10.1021/jacs.8b10296
apa: Li, H., Garner, M. H., Shangguan, Z., Chen, Y., Zheng, Q., Su, T. A., … Venkataraman,
L. (2018). Large variations in the single-molecule conductance of cyclic and bicyclic
silanes. Journal of the American Chemical Society. American Chemical Society.
https://doi.org/10.1021/jacs.8b10296
chicago: Li, Haixing, Marc H. Garner, Zhichun Shangguan, Yan Chen, Qianwen Zheng,
Timothy A. Su, Madhav Neupane, et al. “Large Variations in the Single-Molecule
Conductance of Cyclic and Bicyclic Silanes.” Journal of the American Chemical
Society. American Chemical Society, 2018. https://doi.org/10.1021/jacs.8b10296.
ieee: H. Li et al., “Large variations in the single-molecule conductance
of cyclic and bicyclic silanes,” Journal of the American Chemical Society,
vol. 140, no. 44. American Chemical Society, pp. 15080–15088, 2018.
ista: Li H, Garner MH, Shangguan Z, Chen Y, Zheng Q, Su TA, Neupane M, Liu T, Steigerwald
ML, Ng F, Nuckolls C, Xiao S, Solomon GC, Venkataraman L. 2018. Large variations
in the single-molecule conductance of cyclic and bicyclic silanes. Journal of
the American Chemical Society. 140(44), 15080–15088.
mla: Li, Haixing, et al. “Large Variations in the Single-Molecule Conductance of
Cyclic and Bicyclic Silanes.” Journal of the American Chemical Society,
vol. 140, no. 44, American Chemical Society, 2018, pp. 15080–88, doi:10.1021/jacs.8b10296.
short: H. Li, M.H. Garner, Z. Shangguan, Y. Chen, Q. Zheng, T.A. Su, M. Neupane,
T. Liu, M.L. Steigerwald, F. Ng, C. Nuckolls, S. Xiao, G.C. Solomon, L. Venkataraman,
Journal of the American Chemical Society 140 (2018) 15080–15088.
date_created: 2024-09-09T07:53:50Z
date_published: 2018-10-17T00:00:00Z
date_updated: 2024-12-11T08:21:09Z
day: '17'
doi: 10.1021/jacs.8b10296
extern: '1'
external_id:
pmid:
- '30372051'
fulldoi: https://doi.org/10.1021/jacs.8b10296
intvolume: ' 140'
issue: '44'
language:
- iso: eng
month: '10'
oa_version: None
page: 15080-15088
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: Large variations in the single-molecule conductance of cyclic and bicyclic
silanes
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 140
year: '2018'
...
---
OA_type: closed access
_id: '17928'
abstract:
- lang: eng
text: We study the single-molecule transport properties of small bandgap diketopyrrolopyrrole
oligomers (DPPn, n = 1–4) with lengths varying from 1 to 5 nm. At a low bias voltage,
the conductance decays exponentially as a function of length indicative of nonresonant
transport. However, at a high bias voltage, we observe a remarkably high conductance
close to 10–2 G0 with currents reaching over 0.1 μA across all four oligomers.
These unique transport properties, together with density functional theory-based
transport calculations, suggest a mechanism of resonant transport across the highly
delocalized DPP backbones in the high bias regime. This study thus demonstrates
the unique properties of diketopyrrolopyrrole derivatives in achieving highly
efficient long-range charge transport in single-molecule devices.
article_processing_charge: No
article_type: original
author:
- first_name: Yaping
full_name: Zang, Yaping
last_name: Zang
- first_name: Suman
full_name: Ray, Suman
last_name: Ray
- first_name: E-Dean
full_name: Fung, E-Dean
last_name: Fung
- first_name: Anders
full_name: Borges, Anders
last_name: Borges
- first_name: Marc H.
full_name: Garner, Marc H.
last_name: Garner
- first_name: Michael L.
full_name: Steigerwald, Michael L.
last_name: Steigerwald
- first_name: Gemma C.
full_name: Solomon, Gemma C.
last_name: Solomon
- first_name: Satish
full_name: Patil, Satish
last_name: Patil
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
citation:
ama: Zang Y, Ray S, Fung E-D, et al. Resonant transport in single diketopyrrolopyrrole
junctions. Journal of the American Chemical Society. 2018;140(41):13167-13170.
doi:10.1021/jacs.8b06964
apa: Zang, Y., Ray, S., Fung, E.-D., Borges, A., Garner, M. H., Steigerwald, M.
L., … Venkataraman, L. (2018). Resonant transport in single diketopyrrolopyrrole
junctions. Journal of the American Chemical Society. American Chemical
Society. https://doi.org/10.1021/jacs.8b06964
chicago: Zang, Yaping, Suman Ray, E-Dean Fung, Anders Borges, Marc H. Garner, Michael
L. Steigerwald, Gemma C. Solomon, Satish Patil, and Latha Venkataraman. “Resonant
Transport in Single Diketopyrrolopyrrole Junctions.” Journal of the American
Chemical Society. American Chemical Society, 2018. https://doi.org/10.1021/jacs.8b06964.
ieee: Y. Zang et al., “Resonant transport in single diketopyrrolopyrrole
junctions,” Journal of the American Chemical Society, vol. 140, no. 41.
American Chemical Society, pp. 13167–13170, 2018.
ista: Zang Y, Ray S, Fung E-D, Borges A, Garner MH, Steigerwald ML, Solomon GC,
Patil S, Venkataraman L. 2018. Resonant transport in single diketopyrrolopyrrole
junctions. Journal of the American Chemical Society. 140(41), 13167–13170.
mla: Zang, Yaping, et al. “Resonant Transport in Single Diketopyrrolopyrrole Junctions.”
Journal of the American Chemical Society, vol. 140, no. 41, American Chemical
Society, 2018, pp. 13167–70, doi:10.1021/jacs.8b06964.
short: Y. Zang, S. Ray, E.-D. Fung, A. Borges, M.H. Garner, M.L. Steigerwald, G.C.
Solomon, S. Patil, L. Venkataraman, Journal of the American Chemical Society 140
(2018) 13167–13170.
date_created: 2024-09-09T07:55:19Z
date_published: 2018-10-03T00:00:00Z
date_updated: 2024-12-11T08:36:50Z
day: '03'
doi: 10.1021/jacs.8b06964
extern: '1'
external_id:
pmid:
- '30280891'
fulldoi: https://doi.org/10.1021/jacs.8b06964
intvolume: ' 140'
issue: '41'
language:
- iso: eng
month: '10'
oa_version: None
page: 13167-13170
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: Resonant transport in single diketopyrrolopyrrole junctions
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 140
year: '2018'
...
---
OA_type: closed access
_id: '17929'
abstract:
- lang: eng
text: Polymethine dyes are linear π-conjugated compounds with an odd number of carbons
that display a much greater delocalization in comparison to polyenes that have
an even number of carbon atoms in their main chain. Herein, we perform scanning
tunneling microscope based break-junction measurements on a series of three cyanine
dyes of increasing length. We demonstrate, at the single molecule level, that
these short chain polymethine systems exhibit a substantially smaller decay in
conductance with length (attenuation factor β = 0.04 Å–1) compared to traditional
polyenes (β ≈ 0.2 Å–1). Furthermore, we show that by changing solvent we are able
to shift the β value, demonstrating a remarkable negative β value, with conductance
increasing with molecular length. First principle calculations provide support
for the experimentally observed near-uniform length dependent conductance and
further suggest that the variations in β with solvent are due to solvent-induced
changes in the alignment of the frontier molecular orbitals relative to the Fermi
energy of the leads. A simplified Hückel model suggests that the smaller decay
in conductance correlates with the smaller degree of bond order alternation present
in polymethine compounds compared to polyenes. These findings may enable the design
of molecular wires without a length-dependent decay for efficient electron transport
at the nanoscale.
article_processing_charge: No
article_type: original
author:
- first_name: Suman
full_name: Gunasekaran, Suman
last_name: Gunasekaran
- first_name: Daniel
full_name: Hernangómez-Pérez, Daniel
last_name: Hernangómez-Pérez
- first_name: Iryna
full_name: Davydenko, Iryna
last_name: Davydenko
- first_name: Seth
full_name: Marder, Seth
last_name: Marder
- first_name: Ferdinand
full_name: Evers, Ferdinand
last_name: Evers
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
citation:
ama: Gunasekaran S, Hernangómez-Pérez D, Davydenko I, Marder S, Evers F, Venkataraman
L. Near length-independent conductance in polymethine molecular wires. Nano
Letters. 2018;18(10):6387-6391. doi:10.1021/acs.nanolett.8b02743
apa: Gunasekaran, S., Hernangómez-Pérez, D., Davydenko, I., Marder, S., Evers, F.,
& Venkataraman, L. (2018). Near length-independent conductance in polymethine
molecular wires. Nano Letters. American Chemical Society. https://doi.org/10.1021/acs.nanolett.8b02743
chicago: Gunasekaran, Suman, Daniel Hernangómez-Pérez, Iryna Davydenko, Seth Marder,
Ferdinand Evers, and Latha Venkataraman. “Near Length-Independent Conductance
in Polymethine Molecular Wires.” Nano Letters. American Chemical Society,
2018. https://doi.org/10.1021/acs.nanolett.8b02743.
ieee: S. Gunasekaran, D. Hernangómez-Pérez, I. Davydenko, S. Marder, F. Evers, and
L. Venkataraman, “Near length-independent conductance in polymethine molecular
wires,” Nano Letters, vol. 18, no. 10. American Chemical Society, pp. 6387–6391,
2018.
ista: Gunasekaran S, Hernangómez-Pérez D, Davydenko I, Marder S, Evers F, Venkataraman
L. 2018. Near length-independent conductance in polymethine molecular wires. Nano
Letters. 18(10), 6387–6391.
mla: Gunasekaran, Suman, et al. “Near Length-Independent Conductance in Polymethine
Molecular Wires.” Nano Letters, vol. 18, no. 10, American Chemical Society,
2018, pp. 6387–91, doi:10.1021/acs.nanolett.8b02743.
short: S. Gunasekaran, D. Hernangómez-Pérez, I. Davydenko, S. Marder, F. Evers,
L. Venkataraman, Nano Letters 18 (2018) 6387–6391.
date_created: 2024-09-09T08:05:20Z
date_published: 2018-09-01T00:00:00Z
date_updated: 2024-12-11T08:39:06Z
day: '01'
doi: 10.1021/acs.nanolett.8b02743
extern: '1'
external_id:
pmid:
- '30187756'
fulldoi: https://doi.org/10.1021/acs.nanolett.8b02743
intvolume: ' 18'
issue: '10'
language:
- iso: eng
month: '09'
oa_version: None
page: 6387-6391
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: Near length-independent conductance in polymethine molecular wires
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 18
year: '2018'
...
---
OA_place: publisher
OA_type: free access
_id: '17930'
abstract:
- lang: eng
text: Self-assembled monolayers (SAMs) formed using N-heterocyclic carbenes (NHCs)
have recently emerged as thermally and chemically ultrastable alternatives to
those formed from thiols. The rich chemistry and strong σ-donating ability of
NHCs offer unique prospects for applications in nanoelectronics, sensing, and
electrochemistry. Although stable in SAMs, free carbenes are notoriously reactive,
making their electronic characterization challenging. Here we report the first
investigation of electron transport across single NHC-bound molecules using the
scanning tunneling microscope-based break junction (STM-BJ) technique. We develop
a series of air-stable metal NHC complexes that can be electrochemically reduced
in situ to form NHC–electrode contacts, enabling reliable single-molecule conductance
measurements of NHCs under ambient conditions. Using this approach, we show that
the conductance of an NHC depends on the identity of the single metal atom to
which it is coordinated in the junction. Our observations are supported by density
functional theory (DFT) calculations, which also firmly establish the contributions
of the NHC linker to the junction transport characteristics. Our work demonstrates
a powerful method to probe electron transfer across NHC–electrode interfaces;
more generally, it opens the door to the exploitation of surface-bound NHCs in
constructing novel, functionalized electrodes and/or nanoelectronic devices.
article_processing_charge: No
article_type: original
author:
- first_name: Evan A.
full_name: Doud, Evan A.
last_name: Doud
- first_name: Michael S.
full_name: Inkpen, Michael S.
last_name: Inkpen
- first_name: Giacomo
full_name: Lovat, Giacomo
last_name: Lovat
- first_name: Enrique
full_name: Montes, Enrique
last_name: Montes
- first_name: Daniel W.
full_name: Paley, Daniel W.
last_name: Paley
- first_name: Michael L.
full_name: Steigerwald, Michael L.
last_name: Steigerwald
- first_name: Héctor
full_name: Vázquez, Héctor
last_name: Vázquez
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
- first_name: Xavier
full_name: Roy, Xavier
last_name: Roy
citation:
ama: Doud EA, Inkpen MS, Lovat G, et al. In situ formation of N-heterocyclic carbene-bound
single-molecule junctions. Journal of the American Chemical Society. 2018;140(28):8944-8949.
doi:10.1021/jacs.8b05184
apa: Doud, E. A., Inkpen, M. S., Lovat, G., Montes, E., Paley, D. W., Steigerwald,
M. L., … Roy, X. (2018). In situ formation of N-heterocyclic carbene-bound single-molecule
junctions. Journal of the American Chemical Society. American Chemical
Society. https://doi.org/10.1021/jacs.8b05184
chicago: Doud, Evan A., Michael S. Inkpen, Giacomo Lovat, Enrique Montes, Daniel
W. Paley, Michael L. Steigerwald, Héctor Vázquez, Latha Venkataraman, and Xavier
Roy. “In Situ Formation of N-Heterocyclic Carbene-Bound Single-Molecule Junctions.”
Journal of the American Chemical Society. American Chemical Society, 2018.
https://doi.org/10.1021/jacs.8b05184.
ieee: E. A. Doud et al., “In situ formation of N-heterocyclic carbene-bound
single-molecule junctions,” Journal of the American Chemical Society, vol.
140, no. 28. American Chemical Society, pp. 8944–8949, 2018.
ista: Doud EA, Inkpen MS, Lovat G, Montes E, Paley DW, Steigerwald ML, Vázquez H,
Venkataraman L, Roy X. 2018. In situ formation of N-heterocyclic carbene-bound
single-molecule junctions. Journal of the American Chemical Society. 140(28),
8944–8949.
mla: Doud, Evan A., et al. “In Situ Formation of N-Heterocyclic Carbene-Bound Single-Molecule
Junctions.” Journal of the American Chemical Society, vol. 140, no. 28,
American Chemical Society, 2018, pp. 8944–49, doi:10.1021/jacs.8b05184.
short: E.A. Doud, M.S. Inkpen, G. Lovat, E. Montes, D.W. Paley, M.L. Steigerwald,
H. Vázquez, L. Venkataraman, X. Roy, Journal of the American Chemical Society
140 (2018) 8944–8949.
date_created: 2024-09-09T08:14:38Z
date_published: 2018-07-03T00:00:00Z
date_updated: 2024-12-11T08:42:51Z
day: '03'
doi: 10.1021/jacs.8b05184
extern: '1'
external_id:
pmid:
- '29969027'
fulldoi: https://doi.org/10.1021/jacs.8b05184
intvolume: ' 140'
issue: '28'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1021/jacs.8b05184
month: '07'
oa: 1
oa_version: Published Version
page: 8944-8949
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: In situ formation of N-heterocyclic carbene-bound single-molecule junctions
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 140
year: '2018'
...
---
OA_type: closed access
_id: '17931'
abstract:
- lang: eng
text: 'The tunnelling of electrons through molecules (and through any nanoscale
insulating and dielectric material1) shows exponential attenuation with increasing
length2, a length dependence that is reflected in the ability of the electrons
to carry an electrical current. It was recently demonstrated3,4,5 that coherent
tunnelling through a molecular junction can also be suppressed by destructive
quantum interference6, a mechanism that is not length-dependent. For the carbon-based
molecules studied previously, cancelling all transmission channels would involve
the suppression of contributions to the current from both the π-orbital and σ-orbital
systems. Previous reports of destructive interference have demonstrated a decrease
in transmission only through the π-channel. Here we report a saturated silicon-based
molecule with a functionalized bicyclo[2.2.2]octasilane moiety that exhibits destructive
quantum interference in its σ-system. Although molecular silicon typically forms
conducting wires7, we use a combination of conductance measurements and ab initio
calculations to show that destructive σ-interference, achieved here by locking
the silicon–silicon bonds into eclipsed conformations within a bicyclic molecular
framework, can yield extremely insulating molecules less than a nanometre in length.
Our molecules also exhibit an unusually high thermopower (0.97 millivolts per
kelvin), which is a further experimental signature of the suppression of all tunnelling
paths by destructive interference: calculations indicate that the central bicyclo[2.2.2]octasilane
unit is rendered less conductive than the empty space it occupies. The molecular
design presented here provides a proof-of-concept for a quantum-interference-based
approach to single-molecule insulators.'
article_processing_charge: No
article_type: letter_note
author:
- first_name: Marc H.
full_name: Garner, Marc H.
last_name: Garner
- first_name: Haixing
full_name: Li, Haixing
last_name: Li
- first_name: Yan
full_name: Chen, Yan
last_name: Chen
- first_name: Timothy A.
full_name: Su, Timothy A.
last_name: Su
- first_name: Zhichun
full_name: Shangguan, Zhichun
last_name: Shangguan
- first_name: Daniel W.
full_name: Paley, Daniel W.
last_name: Paley
- first_name: Taifeng
full_name: Liu, Taifeng
last_name: Liu
- first_name: Fay
full_name: Ng, Fay
last_name: Ng
- first_name: Hexing
full_name: Li, Hexing
last_name: Li
- first_name: Shengxiong
full_name: Xiao, Shengxiong
last_name: Xiao
- 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
- first_name: Gemma C.
full_name: Solomon, Gemma C.
last_name: Solomon
citation:
ama: Garner MH, Li H, Chen Y, et al. Comprehensive suppression of single-molecule
conductance using destructive σ-interference. Nature. 2018;558(7710):415-419.
doi:10.1038/s41586-018-0197-9
apa: Garner, M. H., Li, H., Chen, Y., Su, T. A., Shangguan, Z., Paley, D. W., …
Solomon, G. C. (2018). Comprehensive suppression of single-molecule conductance
using destructive σ-interference. Nature. Springer Nature. https://doi.org/10.1038/s41586-018-0197-9
chicago: Garner, Marc H., Haixing Li, Yan Chen, Timothy A. Su, Zhichun Shangguan,
Daniel W. Paley, Taifeng Liu, et al. “Comprehensive Suppression of Single-Molecule
Conductance Using Destructive σ-Interference.” Nature. Springer Nature,
2018. https://doi.org/10.1038/s41586-018-0197-9.
ieee: M. H. Garner et al., “Comprehensive suppression of single-molecule
conductance using destructive σ-interference,” Nature, vol. 558, no. 7710.
Springer Nature, pp. 415–419, 2018.
ista: Garner MH, Li H, Chen Y, Su TA, Shangguan Z, Paley DW, Liu T, Ng F, Li H,
Xiao S, Nuckolls C, Venkataraman L, Solomon GC. 2018. Comprehensive suppression
of single-molecule conductance using destructive σ-interference. Nature. 558(7710),
415–419.
mla: Garner, Marc H., et al. “Comprehensive Suppression of Single-Molecule Conductance
Using Destructive σ-Interference.” Nature, vol. 558, no. 7710, Springer
Nature, 2018, pp. 415–19, doi:10.1038/s41586-018-0197-9.
short: M.H. Garner, H. Li, Y. Chen, T.A. Su, Z. Shangguan, D.W. Paley, T. Liu, F.
Ng, H. Li, S. Xiao, C. Nuckolls, L. Venkataraman, G.C. Solomon, Nature 558 (2018)
415–419.
date_created: 2024-09-09T08:17:04Z
date_published: 2018-06-06T00:00:00Z
date_updated: 2024-12-11T08:51:55Z
day: '06'
doi: 10.1038/s41586-018-0197-9
extern: '1'
external_id:
pmid:
- '29875407'
fulldoi: https://doi.org/10.1038/s41586-018-0197-9
intvolume: ' 558'
issue: '7710'
language:
- iso: eng
month: '06'
oa_version: None
page: 415-419
pmid: 1
publication: Nature
publication_identifier:
eissn:
- 1476-4687
issn:
- 0028-0836
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Comprehensive suppression of single-molecule conductance using destructive
σ-interference
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 558
year: '2018'
...
---
OA_type: closed access
_id: '17932'
abstract:
- lang: eng
text: We compare the ultrafast charge transfer dynamics of molecules on epitaxial
graphene and bilayer graphene grown on Ni(111) interfaces through first principles
calculations and X-ray resonant photoemission spectroscopy. We use 4,4′-bipyridine
as a prototypical molecule for these explorations as the energy level alignment
of core-excited molecular orbitals allows ultrafast injection of electrons from
a substrate to a molecule on a femtosecond timescale. We show that the ultrafast
injection of electrons from the substrate to the molecule is ∼4 times slower on
weakly coupled bilayer graphene than on epitaxial graphene. Through our experiments
and calculations, we can attribute this to a difference in the density of states
close to the Fermi level between graphene and bilayer graphene. We therefore show
how graphene coupling with the substrate influences charge transfer dynamics between
organic molecules and graphene interfaces.
article_processing_charge: No
article_type: original
author:
- first_name: Abhilash
full_name: Ravikumar, Abhilash
last_name: Ravikumar
- first_name: Gregor
full_name: Kladnik, Gregor
last_name: Kladnik
- first_name: Moritz
full_name: Müller, Moritz
last_name: Müller
- first_name: Albano
full_name: Cossaro, Albano
last_name: Cossaro
- first_name: Gregor
full_name: Bavdek, Gregor
last_name: Bavdek
- first_name: Laerte L.
full_name: Patera, Laerte L.
last_name: Patera
- first_name: Daniel
full_name: Sánchez-Portal, Daniel
last_name: Sánchez-Portal
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
- first_name: Alberto
full_name: Morgante, Alberto
last_name: Morgante
- first_name: Gian Paolo
full_name: Brivio, Gian Paolo
last_name: Brivio
- first_name: Dean
full_name: Cvetko, Dean
last_name: Cvetko
- first_name: Guido
full_name: Fratesi, Guido
last_name: Fratesi
citation:
ama: Ravikumar A, Kladnik G, Müller M, et al. Tuning ultrafast electron injection
dynamics at organic-graphene/metal interfaces. Nanoscale. 2018;10(17):8014-8022.
doi:10.1039/c7nr08737c
apa: Ravikumar, A., Kladnik, G., Müller, M., Cossaro, A., Bavdek, G., Patera, L.
L., … Fratesi, G. (2018). Tuning ultrafast electron injection dynamics at organic-graphene/metal
interfaces. Nanoscale. Royal Society of Chemistry. https://doi.org/10.1039/c7nr08737c
chicago: Ravikumar, Abhilash, Gregor Kladnik, Moritz Müller, Albano Cossaro, Gregor
Bavdek, Laerte L. Patera, Daniel Sánchez-Portal, et al. “Tuning Ultrafast Electron
Injection Dynamics at Organic-Graphene/Metal Interfaces.” Nanoscale. Royal
Society of Chemistry, 2018. https://doi.org/10.1039/c7nr08737c.
ieee: A. Ravikumar et al., “Tuning ultrafast electron injection dynamics
at organic-graphene/metal interfaces,” Nanoscale, vol. 10, no. 17. Royal
Society of Chemistry, pp. 8014–8022, 2018.
ista: Ravikumar A, Kladnik G, Müller M, Cossaro A, Bavdek G, Patera LL, Sánchez-Portal
D, Venkataraman L, Morgante A, Brivio GP, Cvetko D, Fratesi G. 2018. Tuning ultrafast
electron injection dynamics at organic-graphene/metal interfaces. Nanoscale. 10(17),
8014–8022.
mla: Ravikumar, Abhilash, et al. “Tuning Ultrafast Electron Injection Dynamics at
Organic-Graphene/Metal Interfaces.” Nanoscale, vol. 10, no. 17, Royal Society
of Chemistry, 2018, pp. 8014–22, doi:10.1039/c7nr08737c.
short: A. Ravikumar, G. Kladnik, M. Müller, A. Cossaro, G. Bavdek, L.L. Patera,
D. Sánchez-Portal, L. Venkataraman, A. Morgante, G.P. Brivio, D. Cvetko, G. Fratesi,
Nanoscale 10 (2018) 8014–8022.
date_created: 2024-09-09T08:19:10Z
date_published: 2018-03-26T00:00:00Z
date_updated: 2024-12-11T08:56:09Z
day: '26'
doi: 10.1039/c7nr08737c
extern: '1'
external_id:
pmid:
- '29667672'
fulldoi: https://doi.org/10.1039/c7nr08737c
intvolume: ' 10'
issue: '17'
language:
- iso: eng
month: '03'
oa_version: None
page: 8014-8022
pmid: 1
publication: Nanoscale
publication_identifier:
eissn:
- 2040-3372
issn:
- 2040-3364
publication_status: published
publisher: Royal Society of Chemistry
quality_controlled: '1'
scopus_import: '1'
status: public
title: Tuning ultrafast electron injection dynamics at organic-graphene/metal interfaces
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 10
year: '2018'
...
---
OA_place: publisher
OA_type: hybrid
_id: '17933'
abstract:
- lang: eng
text: Break-junction measurements are typically aimed at characterizing electronic
properties of single molecules bound between two metal electrodes. Although these
measurements have provided structure–function relationships for such devices,
there is little work that studies the impact of molecule-molecule interactions
on junction characteristics. Here, we use a scanning tunneling microscope based
break-junction technique to study pi-stacked dimer junctions formed with two amine-terminated
conjugated molecules. We show that the conductance, force and flicker noise of
such dimers differ dramatically when compared with the corresponding monomer junctions
and discuss the implications of these results on intra- and inter-molecular charge
transport.
article_processing_charge: No
article_type: original
author:
- first_name: András
full_name: Magyarkuti, András
last_name: Magyarkuti
- first_name: Olgun
full_name: Adak, Olgun
last_name: Adak
- first_name: Andras
full_name: Halbritter, Andras
last_name: Halbritter
- first_name: Latha
full_name: Venkataraman, Latha
id: 9ebb78a5-cc0d-11ee-8322-fae086a32caf
last_name: Venkataraman
orcid: 0000-0002-6957-6089
citation:
ama: Magyarkuti A, Adak O, Halbritter A, Venkataraman L. Electronic and mechanical
characteristics of stacked dimer molecular junctions. Nanoscale. 2018;10(7):3362-3368.
doi:10.1039/c7nr08354h
apa: Magyarkuti, A., Adak, O., Halbritter, A., & Venkataraman, L. (2018). Electronic
and mechanical characteristics of stacked dimer molecular junctions. Nanoscale.
Royal Society of Chemistry. https://doi.org/10.1039/c7nr08354h
chicago: Magyarkuti, András, Olgun Adak, Andras Halbritter, and Latha Venkataraman.
“Electronic and Mechanical Characteristics of Stacked Dimer Molecular Junctions.”
Nanoscale. Royal Society of Chemistry, 2018. https://doi.org/10.1039/c7nr08354h.
ieee: A. Magyarkuti, O. Adak, A. Halbritter, and L. Venkataraman, “Electronic and
mechanical characteristics of stacked dimer molecular junctions,” Nanoscale,
vol. 10, no. 7. Royal Society of Chemistry, pp. 3362–3368, 2018.
ista: Magyarkuti A, Adak O, Halbritter A, Venkataraman L. 2018. Electronic and mechanical
characteristics of stacked dimer molecular junctions. Nanoscale. 10(7), 3362–3368.
mla: Magyarkuti, András, et al. “Electronic and Mechanical Characteristics of Stacked
Dimer Molecular Junctions.” Nanoscale, vol. 10, no. 7, Royal Society of
Chemistry, 2018, pp. 3362–68, doi:10.1039/c7nr08354h.
short: A. Magyarkuti, O. Adak, A. Halbritter, L. Venkataraman, Nanoscale 10 (2018)
3362–3368.
date_created: 2024-09-09T08:30:14Z
date_published: 2018-01-09T00:00:00Z
date_updated: 2024-12-17T10:00:20Z
day: '09'
doi: 10.1039/c7nr08354h
extern: '1'
external_id:
pmid:
- '29388658'
fulldoi: https://doi.org/10.1039/c7nr08354h
intvolume: ' 10'
issue: '7'
language:
- iso: eng
license: https://creativecommons.org/licenses/by-nc/3.0/
main_file_link:
- open_access: '1'
url: "DOI\thttps://doi.org/10.1039/C7NR08354H"
month: '01'
oa: 1
oa_version: Published Version
page: 3362-3368
pmid: 1
publication: Nanoscale
publication_identifier:
eissn:
- 2040-3372
issn:
- 2040-3364
publication_status: published
publisher: Royal Society of Chemistry
quality_controlled: '1'
scopus_import: '1'
status: public
title: Electronic and mechanical characteristics of stacked dimer molecular junctions
tmp:
image: /images/cc_by_nc.png
legal_code_url: https://creativecommons.org/licenses/by-nc/3.0/legalcode
name: Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)
short: CC BY-NC (3.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 10
year: '2018'
...