---
_id: '11590'
abstract:
- lang: eng
  text: 'We investigate the ground-state properties of weakly repulsive one-dimensional
    bosons in the presence of an attractive zero-range impurity potential. First,
    we derive mean-field solutions to the problem on a finite ring for the two asymptotic
    cases: (i) all bosons are bound to the impurity and (ii) all bosons are in a scattering
    state. Moreover, we derive the critical line that separates these regimes in the
    parameter space. In the thermodynamic limit, this critical line determines the
    maximum number of bosons that can be bound by the impurity potential, forming
    an artificial atom. Second, we validate the mean-field results using the flow
    equation approach and the multi-layer multi-configuration time-dependent Hartree
    method for atomic mixtures. While beyond-mean-field effects destroy long-range
    order in the Bose gas, the critical boson number is unaffected. Our findings are
    important for understanding such artificial atoms in low-density Bose gases with
    static and mobile impurities.'
acknowledgement: This work has received funding from the DFG Project No. 413495248
  [VO 2437/1-1] (FB, H-WH, AGV) and European Union's Horizon 2020 research and innovation
  programme under the Marie Skĺodowska-Curie Grant Agreement No. 754411 (AGV). ML
  acknowledges support by the European Research Council (ERC) Starting Grant No. 801770
  (ANGULON). SIM acknowledges support from the NSF through a grant for ITAMP at Harvard
  University.
article_number: '063036'
article_processing_charge: No
article_type: original
author:
- first_name: Fabian
  full_name: Brauneis, Fabian
  last_name: Brauneis
- first_name: Timothy G.
  full_name: Backert, Timothy G.
  last_name: Backert
- first_name: Simeon I.
  full_name: Mistakidis, Simeon I.
  last_name: Mistakidis
- first_name: Mikhail
  full_name: Lemeshko, Mikhail
  id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
  last_name: Lemeshko
  orcid: 0000-0002-6990-7802
- first_name: Hans Werner
  full_name: Hammer, Hans Werner
  last_name: Hammer
- first_name: Artem
  full_name: Volosniev, Artem
  id: 37D278BC-F248-11E8-B48F-1D18A9856A87
  last_name: Volosniev
  orcid: 0000-0003-0393-5525
citation:
  ama: Brauneis F, Backert TG, Mistakidis SI, Lemeshko M, Hammer HW, Volosniev A.
    Artificial atoms from cold bosons in one dimension. <i>New Journal of Physics</i>.
    2022;24(6). doi:<a href="https://doi.org/10.1088/1367-2630/ac78d8">10.1088/1367-2630/ac78d8</a>
  apa: Brauneis, F., Backert, T. G., Mistakidis, S. I., Lemeshko, M., Hammer, H. W.,
    &#38; Volosniev, A. (2022). Artificial atoms from cold bosons in one dimension.
    <i>New Journal of Physics</i>. IOP Publishing. <a href="https://doi.org/10.1088/1367-2630/ac78d8">https://doi.org/10.1088/1367-2630/ac78d8</a>
  chicago: Brauneis, Fabian, Timothy G. Backert, Simeon I. Mistakidis, Mikhail Lemeshko,
    Hans Werner Hammer, and Artem Volosniev. “Artificial Atoms from Cold Bosons in
    One Dimension.” <i>New Journal of Physics</i>. IOP Publishing, 2022. <a href="https://doi.org/10.1088/1367-2630/ac78d8">https://doi.org/10.1088/1367-2630/ac78d8</a>.
  ieee: F. Brauneis, T. G. Backert, S. I. Mistakidis, M. Lemeshko, H. W. Hammer, and
    A. Volosniev, “Artificial atoms from cold bosons in one dimension,” <i>New Journal
    of Physics</i>, vol. 24, no. 6. IOP Publishing, 2022.
  ista: Brauneis F, Backert TG, Mistakidis SI, Lemeshko M, Hammer HW, Volosniev A.
    2022. Artificial atoms from cold bosons in one dimension. New Journal of Physics.
    24(6), 063036.
  mla: Brauneis, Fabian, et al. “Artificial Atoms from Cold Bosons in One Dimension.”
    <i>New Journal of Physics</i>, vol. 24, no. 6, 063036, IOP Publishing, 2022, doi:<a
    href="https://doi.org/10.1088/1367-2630/ac78d8">10.1088/1367-2630/ac78d8</a>.
  short: F. Brauneis, T.G. Backert, S.I. Mistakidis, M. Lemeshko, H.W. Hammer, A.
    Volosniev, New Journal of Physics 24 (2022).
date_created: 2022-07-17T22:01:55Z
date_published: 2022-06-01T00:00:00Z
date_updated: 2025-04-14T07:43:58Z
day: '01'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1088/1367-2630/ac78d8
ec_funded: 1
external_id:
  isi:
  - '000818530000001'
file:
- access_level: open_access
  checksum: dc67b60f2e50e9ef2bd820ca0d7333d2
  content_type: application/pdf
  creator: dernst
  date_created: 2022-07-18T06:33:13Z
  date_updated: 2022-07-18T06:33:13Z
  file_id: '11594'
  file_name: 2022_NewJournalPhysics_Brauneis.pdf
  file_size: 3415721
  relation: main_file
  success: 1
file_date_updated: 2022-07-18T06:33:13Z
has_accepted_license: '1'
intvolume: '        24'
isi: 1
issue: '6'
language:
- iso: eng
month: '06'
oa: 1
oa_version: Published Version
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '754411'
  name: ISTplus - Postdoctoral Fellowships
- _id: 2688CF98-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '801770'
  name: 'Angulon: physics and applications of a new quasiparticle'
publication: New Journal of Physics
publication_identifier:
  issn:
  - 1367-2630
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Artificial atoms from cold bosons in one dimension
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: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 24
year: '2022'
...
---
_id: '11998'
abstract:
- lang: eng
  text: Recently it became possible to study highly excited rotational states of molecules
    in superfluid helium through nonadiabatic alignment experiments (Cherepanov et
    al 2021 Phys. Rev. A 104 L061303). This calls for theoretical approaches that
    go beyond explaining renormalized values of molecular spectroscopic constants,
    which suffices when only the lowest few rotational states are involved. As the
    first step in this direction, here we present a basic quantum mechanical model
    describing highly excited rotational states of molecules in superfluid helium
    nanodroplets. We show that a linear molecule immersed in a superfluid can be seen
    as an effective symmetric top, similar to the rotational structure of radicals,
    such as OH or NO, but with the angular momentum of the superfluid playing the
    role of the electronic angular momentum in free molecules. The simple theory sheds
    light onto what happens when the rotational angular momentum of the molecule increases
    beyond the lowest excited states accessible by infrared spectroscopy. In addition,
    the model allows to estimate the effective rotational and centrifugal distortion
    constants for a broad range of species and to explain the crossover between light
    and heavy molecules in superfluid 4He in terms of the many-body wavefunction structure.
    Some of the above mentioned insights can be acquired by analyzing a simple 2 ×
    2 matrix.
acknowledgement: IC acknowledges the support by the European Union's Horizon 2020
  research and innovation programme under the Marie Skłodowska-Curie Grant Agreement
  No. 665385. GB acknowledges support from the Austrian Science Fund (FWF), under
  Project No. M2461-N27 and from the Deutsche Forschungsgemeinschaft (DFG, German
  Research Foundation) under Germany's Excellence Strategy EXC2181/1-390900948 (the
  Heidelberg STRUCTURES Excellence Cluster). ML acknowledges support by the Austrian
  Science Fund (FWF), under Project No. P29902-N27, and by the European Research Council
  (ERC) starting Grant No. 801770 (ANGULON). HS acknowledges support from the Independent
  Research Fund Denmark (Project No. 8021-00232B) and from the Villum Fonden through
  a Villum Investigator Grant No. 25886.
article_number: '075004'
article_processing_charge: Yes
article_type: original
author:
- first_name: Igor
  full_name: Cherepanov, Igor
  id: 339C7E5A-F248-11E8-B48F-1D18A9856A87
  last_name: Cherepanov
- first_name: Giacomo
  full_name: Bighin, Giacomo
  id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
  last_name: Bighin
  orcid: 0000-0001-8823-9777
- first_name: Constant A.
  full_name: Schouder, Constant A.
  last_name: Schouder
- first_name: Adam S.
  full_name: Chatterley, Adam S.
  last_name: Chatterley
- first_name: Henrik
  full_name: Stapelfeldt, Henrik
  last_name: Stapelfeldt
- first_name: Mikhail
  full_name: Lemeshko, Mikhail
  id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
  last_name: Lemeshko
  orcid: 0000-0002-6990-7802
citation:
  ama: Cherepanov I, Bighin G, Schouder CA, Chatterley AS, Stapelfeldt H, Lemeshko
    M. A simple model for high rotational excitations of molecules in a superfluid.
    <i>New Journal of Physics</i>. 2022;24(7). doi:<a href="https://doi.org/10.1088/1367-2630/ac8113">10.1088/1367-2630/ac8113</a>
  apa: Cherepanov, I., Bighin, G., Schouder, C. A., Chatterley, A. S., Stapelfeldt,
    H., &#38; Lemeshko, M. (2022). A simple model for high rotational excitations
    of molecules in a superfluid. <i>New Journal of Physics</i>. IOP Publishing. <a
    href="https://doi.org/10.1088/1367-2630/ac8113">https://doi.org/10.1088/1367-2630/ac8113</a>
  chicago: Cherepanov, Igor, Giacomo Bighin, Constant A. Schouder, Adam S. Chatterley,
    Henrik Stapelfeldt, and Mikhail Lemeshko. “A Simple Model for High Rotational
    Excitations of Molecules in a Superfluid.” <i>New Journal of Physics</i>. IOP
    Publishing, 2022. <a href="https://doi.org/10.1088/1367-2630/ac8113">https://doi.org/10.1088/1367-2630/ac8113</a>.
  ieee: I. Cherepanov, G. Bighin, C. A. Schouder, A. S. Chatterley, H. Stapelfeldt,
    and M. Lemeshko, “A simple model for high rotational excitations of molecules
    in a superfluid,” <i>New Journal of Physics</i>, vol. 24, no. 7. IOP Publishing,
    2022.
  ista: Cherepanov I, Bighin G, Schouder CA, Chatterley AS, Stapelfeldt H, Lemeshko
    M. 2022. A simple model for high rotational excitations of molecules in a superfluid.
    New Journal of Physics. 24(7), 075004.
  mla: Cherepanov, Igor, et al. “A Simple Model for High Rotational Excitations of
    Molecules in a Superfluid.” <i>New Journal of Physics</i>, vol. 24, no. 7, 075004,
    IOP Publishing, 2022, doi:<a href="https://doi.org/10.1088/1367-2630/ac8113">10.1088/1367-2630/ac8113</a>.
  short: I. Cherepanov, G. Bighin, C.A. Schouder, A.S. Chatterley, H. Stapelfeldt,
    M. Lemeshko, New Journal of Physics 24 (2022).
corr_author: '1'
date_created: 2022-08-28T22:02:01Z
date_published: 2022-08-11T00:00:00Z
date_updated: 2025-05-14T11:20:18Z
day: '11'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1088/1367-2630/ac8113
ec_funded: 1
external_id:
  isi:
  - '000839216900001'
file:
- access_level: open_access
  checksum: 10116a08d3489befc13dba2cc44490f1
  content_type: application/pdf
  creator: alisjak
  date_created: 2022-08-29T09:57:40Z
  date_updated: 2022-08-29T09:57:40Z
  file_id: '12005'
  file_name: 2022_NewJournalofPhysics_Cherepanov.pdf
  file_size: 1912882
  relation: main_file
  success: 1
file_date_updated: 2022-08-29T09:57:40Z
has_accepted_license: '1'
intvolume: '        24'
isi: 1
issue: '7'
language:
- iso: eng
month: '08'
oa: 1
oa_version: Published Version
project:
- _id: 2564DBCA-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '665385'
  name: International IST Doctoral Program
- _id: 2688CF98-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '801770'
  name: 'Angulon: physics and applications of a new quasiparticle'
- _id: 26986C82-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: M02641
  name: A path-integral approach to composite impurities
publication: New Journal of Physics
publication_identifier:
  issn:
  - 1367-2630
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: A simple model for high rotational excitations of molecules in a superfluid
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: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 24
year: '2022'
...
---
_id: '17070'
abstract:
- lang: eng
  text: We investigate the formation of magnetic Bose polaron, an impurity atom dressed
    by spin-wave excitations, in a one-dimensional spinor Bose gas. Within an effective
    potential model, the impurity is strongly confined by the host excitations which
    can even overcome the impurity-medium repulsion leading to a self-localized quasi-particle
    state. The phase diagram of the attractive and self-bound repulsive magnetic polaron,
    repulsive non-magnetic (Fröhlich-type) polaron and impurity-medium phase-separation
    regimes is explored with respect to the Rabi-coupling between the spin components,
    spin–spin interactions and impurity-medium coupling. The residue of such magnetic
    polarons decreases substantially in both strong attractive and repulsive branches
    with strong impurity-spin interactions, illustrating significant dressing of the
    impurity. The impurity can be used to probe and maneuver the spin polarization
    of the magnetic medium while suppressing ferromagnetic spin–spin correlations.
    It is shown that mean-field theory fails as the spinor gas approaches immiscibility
    since the generated spin-wave excitations are prominent. Our findings illustrate
    that impurities can be utilized to generate controllable spin–spin correlations
    and magnetic polaron states which can be realized with current cold atom setups.
article_number: '083030'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: S I
  full_name: Mistakidis, S I
  last_name: Mistakidis
- first_name: Georgios
  full_name: Koutentakis, Georgios
  id: d7b23d3a-9e21-11ec-b482-f76739596b95
  last_name: Koutentakis
- first_name: F
  full_name: Grusdt, F
  last_name: Grusdt
- first_name: P
  full_name: Schmelcher, P
  last_name: Schmelcher
- first_name: H R
  full_name: Sadeghpour, H R
  last_name: Sadeghpour
citation:
  ama: 'Mistakidis SI, Koutentakis G, Grusdt F, Schmelcher P, Sadeghpour HR. Inducing
    spin-order with an impurity: phase diagram of the magnetic Bose polaron. <i>New
    Journal of Physics</i>. 2022;24(8). doi:<a href="https://doi.org/10.1088/1367-2630/ac836c">10.1088/1367-2630/ac836c</a>'
  apa: 'Mistakidis, S. I., Koutentakis, G., Grusdt, F., Schmelcher, P., &#38; Sadeghpour,
    H. R. (2022). Inducing spin-order with an impurity: phase diagram of the magnetic
    Bose polaron. <i>New Journal of Physics</i>. IOP Publishing. <a href="https://doi.org/10.1088/1367-2630/ac836c">https://doi.org/10.1088/1367-2630/ac836c</a>'
  chicago: 'Mistakidis, S I, Georgios Koutentakis, F Grusdt, P Schmelcher, and H R
    Sadeghpour. “Inducing Spin-Order with an Impurity: Phase Diagram of the Magnetic
    Bose Polaron.” <i>New Journal of Physics</i>. IOP Publishing, 2022. <a href="https://doi.org/10.1088/1367-2630/ac836c">https://doi.org/10.1088/1367-2630/ac836c</a>.'
  ieee: 'S. I. Mistakidis, G. Koutentakis, F. Grusdt, P. Schmelcher, and H. R. Sadeghpour,
    “Inducing spin-order with an impurity: phase diagram of the magnetic Bose polaron,”
    <i>New Journal of Physics</i>, vol. 24, no. 8. IOP Publishing, 2022.'
  ista: 'Mistakidis SI, Koutentakis G, Grusdt F, Schmelcher P, Sadeghpour HR. 2022.
    Inducing spin-order with an impurity: phase diagram of the magnetic Bose polaron.
    New Journal of Physics. 24(8), 083030.'
  mla: 'Mistakidis, S. I., et al. “Inducing Spin-Order with an Impurity: Phase Diagram
    of the Magnetic Bose Polaron.” <i>New Journal of Physics</i>, vol. 24, no. 8,
    083030, IOP Publishing, 2022, doi:<a href="https://doi.org/10.1088/1367-2630/ac836c">10.1088/1367-2630/ac836c</a>.'
  short: S.I. Mistakidis, G. Koutentakis, F. Grusdt, P. Schmelcher, H.R. Sadeghpour,
    New Journal of Physics 24 (2022).
date_created: 2024-05-29T06:11:35Z
date_published: 2022-09-08T00:00:00Z
date_updated: 2024-07-31T12:14:55Z
day: '08'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1088/1367-2630/ac836c
external_id:
  arxiv:
  - '2204.10960'
file:
- access_level: open_access
  checksum: 85776a9d3abe163b33b322c8e346752a
  content_type: application/pdf
  creator: dernst
  date_created: 2024-07-31T12:13:16Z
  date_updated: 2024-07-31T12:13:16Z
  file_id: '17358'
  file_name: 2022_NewJournPhysics_Mistakidis.pdf
  file_size: 4201283
  relation: main_file
  success: 1
file_date_updated: 2024-07-31T12:13:16Z
has_accepted_license: '1'
intvolume: '        24'
issue: '8'
language:
- iso: eng
month: '09'
oa: 1
oa_version: Published Version
publication: New Journal of Physics
publication_identifier:
  issn:
  - 1367-2630
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Inducing spin-order with an impurity: phase diagram of the magnetic Bose polaron'
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: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 24
year: '2022'
...
---
_id: '10628'
abstract:
- lang: eng
  text: The surface states of 3D topological insulators in general have negligible
    quantum oscillations (QOs) when the chemical potential is tuned to the Dirac points.
    In contrast, we find that topological Kondo insulators (TKIs) can support surface
    states with an arbitrarily large Fermi surface (FS) when the chemical potential
    is pinned to the Dirac point. We illustrate that these FSs give rise to finite-frequency
    QOs, which can become comparable to the extremal area of the unhybridized bulk
    bands. We show that this occurs when the crystal symmetry is lowered from cubic
    to tetragonal in a minimal two-orbital model. We label such surface modes as 'shadow
    surface states'. Moreover, we show that the sufficient next-nearest neighbor out-of-plane
    hybridization leading to shadow surface states can be self-consistently stabilized
    for tetragonal TKIs. Consequently, shadow surface states provide an important
    example of high-frequency QOs beyond the context of cubic TKIs.
acknowledgement: PG acknowledges support from National Science Foundation Awards No.
  DMR-1824265 for this work. AG acknowledges support from the European Union's Horizon
  2020 research and innovation program under the Marie Skłodowska-Curie Grant Agreement
  No. 754411. EMN is supported by ASU startup grant. OE is in part supported by NSF-DMR-1904716.
article_number: '123042'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Areg
  full_name: Ghazaryan, Areg
  id: 4AF46FD6-F248-11E8-B48F-1D18A9856A87
  last_name: Ghazaryan
  orcid: 0000-0001-9666-3543
- first_name: Emilian M.
  full_name: Nica, Emilian M.
  last_name: Nica
- first_name: Onur
  full_name: Erten, Onur
  last_name: Erten
- first_name: Pouyan
  full_name: Ghaemi, Pouyan
  last_name: Ghaemi
citation:
  ama: Ghazaryan A, Nica EM, Erten O, Ghaemi P. Shadow surface states in topological
    Kondo insulators. <i>New Journal of Physics</i>. 2021;23(12). doi:<a href="https://doi.org/10.1088/1367-2630/ac4124">10.1088/1367-2630/ac4124</a>
  apa: Ghazaryan, A., Nica, E. M., Erten, O., &#38; Ghaemi, P. (2021). Shadow surface
    states in topological Kondo insulators. <i>New Journal of Physics</i>. IOP Publishing.
    <a href="https://doi.org/10.1088/1367-2630/ac4124">https://doi.org/10.1088/1367-2630/ac4124</a>
  chicago: Ghazaryan, Areg, Emilian M. Nica, Onur Erten, and Pouyan Ghaemi. “Shadow
    Surface States in Topological Kondo Insulators.” <i>New Journal of Physics</i>.
    IOP Publishing, 2021. <a href="https://doi.org/10.1088/1367-2630/ac4124">https://doi.org/10.1088/1367-2630/ac4124</a>.
  ieee: A. Ghazaryan, E. M. Nica, O. Erten, and P. Ghaemi, “Shadow surface states
    in topological Kondo insulators,” <i>New Journal of Physics</i>, vol. 23, no.
    12. IOP Publishing, 2021.
  ista: Ghazaryan A, Nica EM, Erten O, Ghaemi P. 2021. Shadow surface states in topological
    Kondo insulators. New Journal of Physics. 23(12), 123042.
  mla: Ghazaryan, Areg, et al. “Shadow Surface States in Topological Kondo Insulators.”
    <i>New Journal of Physics</i>, vol. 23, no. 12, 123042, IOP Publishing, 2021,
    doi:<a href="https://doi.org/10.1088/1367-2630/ac4124">10.1088/1367-2630/ac4124</a>.
  short: A. Ghazaryan, E.M. Nica, O. Erten, P. Ghaemi, New Journal of Physics 23 (2021).
corr_author: '1'
date_created: 2022-01-16T23:01:28Z
date_published: 2021-12-23T00:00:00Z
date_updated: 2025-04-14T07:43:48Z
day: '23'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1088/1367-2630/ac4124
ec_funded: 1
external_id:
  arxiv:
  - '2012.11625'
  isi:
  - '000734063700001'
file:
- access_level: open_access
  checksum: 0c3cb6816242fa8afd1cc87a5fe77821
  content_type: application/pdf
  creator: cchlebak
  date_created: 2022-01-17T10:01:58Z
  date_updated: 2022-01-17T10:01:58Z
  file_id: '10632'
  file_name: 2021_NewJourPhys_Ghazaryan.pdf
  file_size: 2533102
  relation: main_file
  success: 1
file_date_updated: 2022-01-17T10:01:58Z
has_accepted_license: '1'
intvolume: '        23'
isi: 1
issue: '12'
language:
- iso: eng
month: '12'
oa: 1
oa_version: Published Version
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '754411'
  name: ISTplus - Postdoctoral Fellowships
publication: New Journal of Physics
publication_identifier:
  issn:
  - 1367-2630
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Shadow surface states in topological Kondo insulators
tmp:
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  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 23
year: '2021'
...
---
_id: '8644'
abstract:
- lang: eng
  text: Determining the phase diagram of systems consisting of smaller subsystems
    'connected' via a tunable coupling is a challenging task relevant for a variety
    of physical settings. A general question is whether new phases, not present in
    the uncoupled limit, may arise. We use machine learning and a suitable quasidistance
    between different points of the phase diagram to study layered spin models, in
    which the spin variables constituting each of the uncoupled systems (to which
    we refer as layers) are coupled to each other via an interlayer coupling. In such
    systems, in general, composite order parameters involving spins of different layers
    may emerge as a consequence of the interlayer coupling. We focus on the layered
    Ising and Ashkin–Teller models as a paradigmatic case study, determining their
    phase diagram via the application of a machine learning algorithm to the Monte
    Carlo data. Remarkably our technique is able to correctly characterize all the
    system phases also in the case of hidden order parameters, i.e. order parameters
    whose expression in terms of the microscopic configurations would require additional
    preprocessing of the data fed to the algorithm. We correctly retrieve the three
    known phases of the Ashkin–Teller model with ferromagnetic couplings, including
    the phase described by a composite order parameter. For the bilayer and trilayer
    Ising models the phases we find are only the ferromagnetic and the paramagnetic
    ones. Within the approach we introduce, owing to the construction of convolutional
    neural networks, naturally suitable for layered image-like data with arbitrary
    number of layers, no preprocessing of the Monte Carlo data is needed, also with
    regard to its spatial structure. The physical meaning of our results is discussed
    and compared with analytical data, where available. Yet, the method can be used
    without any a priori knowledge of the phases one seeks to find and can be applied
    to other models and structures.
acknowledgement: We thank Gesualdo Delfino, Michele Fabrizio, Piero Ferrarese, Robert
  Konik, Christoph Lampert and Mikhail Lemeshko for stimulating discussions at various
  stages of this work. WR has received funding from the EU Horizon 2020 program under
  the Marie Skłodowska-Curie Grant Agreement No. 665385 and is a recipient of a DOC
  Fellowship of the Austrian Academy of Sciences. GB acknowledges support from the
  Austrian Science Fund (FWF), under project No. M2641-N27. ND acknowledges support
  by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) via Collaborative
  Research Center SFB 1225 (ISOQUANT)--project-id 273811115--and under Germany's Excellence
  Strategy 'EXC-2181/1-390900948' (the Heidelberg STRUCTURES Excellence Cluster).
article_number: '093026'
article_processing_charge: No
article_type: original
author:
- first_name: Wojciech
  full_name: Rzadkowski, Wojciech
  id: 48C55298-F248-11E8-B48F-1D18A9856A87
  last_name: Rzadkowski
  orcid: 0000-0002-1106-4419
- first_name: N
  full_name: Defenu, N
  last_name: Defenu
- first_name: S
  full_name: Chiacchiera, S
  last_name: Chiacchiera
- first_name: A
  full_name: Trombettoni, A
  last_name: Trombettoni
- first_name: Giacomo
  full_name: Bighin, Giacomo
  id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
  last_name: Bighin
  orcid: 0000-0001-8823-9777
citation:
  ama: Rzadkowski W, Defenu N, Chiacchiera S, Trombettoni A, Bighin G. Detecting composite
    orders in layered models via machine learning. <i>New Journal of Physics</i>.
    2020;22(9). doi:<a href="https://doi.org/10.1088/1367-2630/abae44">10.1088/1367-2630/abae44</a>
  apa: Rzadkowski, W., Defenu, N., Chiacchiera, S., Trombettoni, A., &#38; Bighin,
    G. (2020). Detecting composite orders in layered models via machine learning.
    <i>New Journal of Physics</i>. IOP Publishing. <a href="https://doi.org/10.1088/1367-2630/abae44">https://doi.org/10.1088/1367-2630/abae44</a>
  chicago: Rzadkowski, Wojciech, N Defenu, S Chiacchiera, A Trombettoni, and Giacomo
    Bighin. “Detecting Composite Orders in Layered Models via Machine Learning.” <i>New
    Journal of Physics</i>. IOP Publishing, 2020. <a href="https://doi.org/10.1088/1367-2630/abae44">https://doi.org/10.1088/1367-2630/abae44</a>.
  ieee: W. Rzadkowski, N. Defenu, S. Chiacchiera, A. Trombettoni, and G. Bighin, “Detecting
    composite orders in layered models via machine learning,” <i>New Journal of Physics</i>,
    vol. 22, no. 9. IOP Publishing, 2020.
  ista: Rzadkowski W, Defenu N, Chiacchiera S, Trombettoni A, Bighin G. 2020. Detecting
    composite orders in layered models via machine learning. New Journal of Physics.
    22(9), 093026.
  mla: Rzadkowski, Wojciech, et al. “Detecting Composite Orders in Layered Models
    via Machine Learning.” <i>New Journal of Physics</i>, vol. 22, no. 9, 093026,
    IOP Publishing, 2020, doi:<a href="https://doi.org/10.1088/1367-2630/abae44">10.1088/1367-2630/abae44</a>.
  short: W. Rzadkowski, N. Defenu, S. Chiacchiera, A. Trombettoni, G. Bighin, New
    Journal of Physics 22 (2020).
corr_author: '1'
date_created: 2020-10-11T22:01:14Z
date_published: 2020-09-01T00:00:00Z
date_updated: 2026-04-07T14:20:12Z
day: '01'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1088/1367-2630/abae44
ec_funded: 1
external_id:
  isi:
  - '000573298000001'
file:
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has_accepted_license: '1'
intvolume: '        22'
isi: 1
issue: '9'
language:
- iso: eng
month: '09'
oa: 1
oa_version: Published Version
project:
- _id: 2564DBCA-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '665385'
  name: International IST Doctoral Program
- _id: 05A235A0-7A3F-11EA-A408-12923DDC885E
  grant_number: '25681'
  name: Analytic and machine learning approaches to composite quantum impurities
- _id: 26986C82-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: M02641
  name: A path-integral approach to composite impurities
publication: New Journal of Physics
publication_identifier:
  issn:
  - 1367-2630
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
related_material:
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    status: public
scopus_import: '1'
status: public
title: Detecting composite orders in layered models via machine learning
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: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 22
year: '2020'
...
---
_id: '9164'
article_number: '060201'
article_processing_charge: No
article_type: letter_note
author:
- first_name: Thomas
  full_name: Speck, Thomas
  last_name: Speck
- first_name: Julien
  full_name: Tailleur, Julien
  last_name: Tailleur
- first_name: Jérémie A
  full_name: Palacci, Jérémie A
  id: 8fb92548-2b22-11eb-b7c1-a3f0d08d7c7d
  last_name: Palacci
  orcid: 0000-0002-7253-9465
citation:
  ama: Speck T, Tailleur J, Palacci JA. Focus on active colloids and nanoparticles.
    <i>New Journal of Physics</i>. 2020;22(6). doi:<a href="https://doi.org/10.1088/1367-2630/ab90d9">10.1088/1367-2630/ab90d9</a>
  apa: Speck, T., Tailleur, J., &#38; Palacci, J. A. (2020). Focus on active colloids
    and nanoparticles. <i>New Journal of Physics</i>. IOP Publishing. <a href="https://doi.org/10.1088/1367-2630/ab90d9">https://doi.org/10.1088/1367-2630/ab90d9</a>
  chicago: Speck, Thomas, Julien Tailleur, and Jérémie A Palacci. “Focus on Active
    Colloids and Nanoparticles.” <i>New Journal of Physics</i>. IOP Publishing, 2020.
    <a href="https://doi.org/10.1088/1367-2630/ab90d9">https://doi.org/10.1088/1367-2630/ab90d9</a>.
  ieee: T. Speck, J. Tailleur, and J. A. Palacci, “Focus on active colloids and nanoparticles,”
    <i>New Journal of Physics</i>, vol. 22, no. 6. IOP Publishing, 2020.
  ista: Speck T, Tailleur J, Palacci JA. 2020. Focus on active colloids and nanoparticles.
    New Journal of Physics. 22(6), 060201.
  mla: Speck, Thomas, et al. “Focus on Active Colloids and Nanoparticles.” <i>New
    Journal of Physics</i>, vol. 22, no. 6, 060201, IOP Publishing, 2020, doi:<a href="https://doi.org/10.1088/1367-2630/ab90d9">10.1088/1367-2630/ab90d9</a>.
  short: T. Speck, J. Tailleur, J.A. Palacci, New Journal of Physics 22 (2020).
date_created: 2021-02-18T14:17:32Z
date_published: 2020-06-01T00:00:00Z
date_updated: 2021-02-18T14:57:39Z
day: '01'
ddc:
- '530'
doi: 10.1088/1367-2630/ab90d9
extern: '1'
file:
- access_level: open_access
  checksum: 02759f3ab228c1a061e747155a20f851
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  creator: cziletti
  date_created: 2021-02-18T14:53:33Z
  date_updated: 2021-02-18T14:53:33Z
  file_id: '9169'
  file_name: 2020_NewJournPhys_Speck.pdf
  file_size: 953338
  relation: main_file
  success: 1
file_date_updated: 2021-02-18T14:53:33Z
has_accepted_license: '1'
intvolume: '        22'
issue: '6'
keyword:
- General Physics and Astronomy
language:
- iso: eng
month: '06'
oa: 1
oa_version: Published Version
publication: New Journal of Physics
publication_identifier:
  issn:
  - 1367-2630
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Focus on active colloids and nanoparticles
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: D865714E-FA4E-11E9-B85B-F5C5E5697425
volume: 22
year: '2020'
...
---
_id: '18200'
abstract:
- lang: eng
  text: "We present an optical setup with focus-tunable lenses to dynamically control
    the waist and focus position of a laser beam, in which we transport a trapped
    ultracold cloud of 87Rb over a distance of \r\n. The scheme allows us to shift
    the focus position at constant waist, providing uniform trapping conditions over
    the full transport length. The fraction of atoms that are transported over the
    entire distance comes near to unity, while the heating of the cloud is in the
    range of a few microkelvin. We characterize the position stability of the focus
    and show that residual drift rates in focus position can be compensated for by
    counteracting with the tunable lenses. Beyond being a compact and robust scheme
    to transport ultracold atoms, the reported control of laser beams makes dynamic
    tailoring of trapping potentials possible. As an example, we steer the size of
    the atomic cloud by changing the waist size of the dipole beam."
article_number: '093028'
article_processing_charge: Yes
article_type: original
author:
- first_name: Julian
  full_name: Leonard, Julian
  id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
  last_name: Leonard
- first_name: Moonjoo
  full_name: Lee, Moonjoo
  last_name: Lee
- first_name: Andrea
  full_name: Morales, Andrea
  last_name: Morales
- first_name: Thomas M
  full_name: Karg, Thomas M
  last_name: Karg
- first_name: Tilman
  full_name: Esslinger, Tilman
  last_name: Esslinger
- first_name: Tobias
  full_name: Donner, Tobias
  last_name: Donner
citation:
  ama: Leonard J, Lee M, Morales A, Karg TM, Esslinger T, Donner T. Optical transport
    and manipulation of an ultracold atomic cloud using focus-tunable lenses. <i>New
    Journal of Physics</i>. 2014;16(9). doi:<a href="https://doi.org/10.1088/1367-2630/16/9/093028">10.1088/1367-2630/16/9/093028</a>
  apa: Leonard, J., Lee, M., Morales, A., Karg, T. M., Esslinger, T., &#38; Donner,
    T. (2014). Optical transport and manipulation of an ultracold atomic cloud using
    focus-tunable lenses. <i>New Journal of Physics</i>. IOP Publishing. <a href="https://doi.org/10.1088/1367-2630/16/9/093028">https://doi.org/10.1088/1367-2630/16/9/093028</a>
  chicago: Leonard, Julian, Moonjoo Lee, Andrea Morales, Thomas M Karg, Tilman Esslinger,
    and Tobias Donner. “Optical Transport and Manipulation of an Ultracold Atomic
    Cloud Using Focus-Tunable Lenses.” <i>New Journal of Physics</i>. IOP Publishing,
    2014. <a href="https://doi.org/10.1088/1367-2630/16/9/093028">https://doi.org/10.1088/1367-2630/16/9/093028</a>.
  ieee: J. Leonard, M. Lee, A. Morales, T. M. Karg, T. Esslinger, and T. Donner, “Optical
    transport and manipulation of an ultracold atomic cloud using focus-tunable lenses,”
    <i>New Journal of Physics</i>, vol. 16, no. 9. IOP Publishing, 2014.
  ista: Leonard J, Lee M, Morales A, Karg TM, Esslinger T, Donner T. 2014. Optical
    transport and manipulation of an ultracold atomic cloud using focus-tunable lenses.
    New Journal of Physics. 16(9), 093028.
  mla: Leonard, Julian, et al. “Optical Transport and Manipulation of an Ultracold
    Atomic Cloud Using Focus-Tunable Lenses.” <i>New Journal of Physics</i>, vol.
    16, no. 9, 093028, IOP Publishing, 2014, doi:<a href="https://doi.org/10.1088/1367-2630/16/9/093028">10.1088/1367-2630/16/9/093028</a>.
  short: J. Leonard, M. Lee, A. Morales, T.M. Karg, T. Esslinger, T. Donner, New Journal
    of Physics 16 (2014).
date_created: 2024-10-07T11:50:00Z
date_published: 2014-09-23T00:00:00Z
date_updated: 2024-10-07T12:07:48Z
day: '23'
doi: 10.1088/1367-2630/16/9/093028
extern: '1'
intvolume: '        16'
issue: '9'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1088/1367-2630/16/9/093028
month: '09'
oa: 1
oa_version: Published Version
publication: New Journal of Physics
publication_identifier:
  issn:
  - 1367-2630
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Optical transport and manipulation of an ultracold atomic cloud using focus-tunable
  lenses
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 16
year: '2014'
...
