---
_id: '13966'
abstract:
- lang: eng
text: We present a low-scaling diagrammatic Monte Carlo approach to molecular correlation
energies. Using combinatorial graph theory to encode many-body Hugenholtz diagrams,
we sample the Møller-Plesset (MPn) perturbation series, obtaining accurate correlation
energies up to n=5, with quadratic scaling in the number of basis functions. Our
technique reduces the computational complexity of the molecular many-fermion correlation
problem, opening up the possibility of low-scaling, accurate stochastic computations
for a wide class of many-body systems described by Hugenholtz diagrams.
acknowledgement: We acknowledge stimulating discussions with Sergey Varganov, Artur
Izmaylov, Jacek Kłos, Piotr Żuchowski, Dominika Zgid, Nikolay Prokof'ev, Boris Svistunov,
Robert Parrish, and Andreas Heßelmann. G.B. and Q.P.H. acknowledge support from
the Austrian Science Fund (FWF) under Projects No. M2641-N27 and No. M2751. M.L.
acknowledges support by the FWF under Project No. P29902-N27, and by the European
Research Council (ERC) Starting Grant No. 801770 (ANGULON). T.V.T. was supported
by the NSF CAREER award No. PHY-2045681. This work is supported by the German Research
Foundation (DFG) under Germany's Excellence Strategy EXC2181/1-390900948 (the Heidelberg
STRUCTURES Excellence Cluster). The authors acknowledge support by the state of
Baden-Württemberg through bwHPC.
article_number: '045115'
article_processing_charge: No
article_type: original
author:
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: Quoc P
full_name: Ho, Quoc P
id: 3DD82E3C-F248-11E8-B48F-1D18A9856A87
last_name: Ho
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
- first_name: T. V.
full_name: Tscherbul, T. V.
last_name: Tscherbul
citation:
ama: 'Bighin G, Ho QP, Lemeshko M, Tscherbul TV. Diagrammatic Monte Carlo for electronic
correlation in molecules: High-order many-body perturbation theory with low scaling.
Physical Review B. 2023;108(4). doi:10.1103/PhysRevB.108.045115'
apa: 'Bighin, G., Ho, Q. P., Lemeshko, M., & Tscherbul, T. V. (2023). Diagrammatic
Monte Carlo for electronic correlation in molecules: High-order many-body perturbation
theory with low scaling. Physical Review B. American Physical Society.
https://doi.org/10.1103/PhysRevB.108.045115'
chicago: 'Bighin, Giacomo, Quoc P Ho, Mikhail Lemeshko, and T. V. Tscherbul. “Diagrammatic
Monte Carlo for Electronic Correlation in Molecules: High-Order Many-Body Perturbation
Theory with Low Scaling.” Physical Review B. American Physical Society,
2023. https://doi.org/10.1103/PhysRevB.108.045115.'
ieee: 'G. Bighin, Q. P. Ho, M. Lemeshko, and T. V. Tscherbul, “Diagrammatic Monte
Carlo for electronic correlation in molecules: High-order many-body perturbation
theory with low scaling,” Physical Review B, vol. 108, no. 4. American
Physical Society, 2023.'
ista: 'Bighin G, Ho QP, Lemeshko M, Tscherbul TV. 2023. Diagrammatic Monte Carlo
for electronic correlation in molecules: High-order many-body perturbation theory
with low scaling. Physical Review B. 108(4), 045115.'
mla: 'Bighin, Giacomo, et al. “Diagrammatic Monte Carlo for Electronic Correlation
in Molecules: High-Order Many-Body Perturbation Theory with Low Scaling.” Physical
Review B, vol. 108, no. 4, 045115, American Physical Society, 2023, doi:10.1103/PhysRevB.108.045115.'
short: G. Bighin, Q.P. Ho, M. Lemeshko, T.V. Tscherbul, Physical Review B 108 (2023).
date_created: 2023-08-06T22:01:10Z
date_published: 2023-07-15T00:00:00Z
date_updated: 2023-08-07T08:41:29Z
day: '15'
department:
- _id: MiLe
- _id: TaHa
doi: 10.1103/PhysRevB.108.045115
ec_funded: 1
external_id:
arxiv:
- '2203.12666'
intvolume: ' 108'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2203.12666
month: '07'
oa: 1
oa_version: Preprint
project:
- _id: 26986C82-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: M02641
name: A path-integral approach to composite impurities
- _id: 26B96266-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: M02751
name: Algebro-Geometric Applications of Factorization Homology
- _id: 26031614-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P29902
name: Quantum rotations in the presence of a many-body environment
- _id: 2688CF98-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '801770'
name: 'Angulon: physics and applications of a new quasiparticle'
publication: Physical Review B
publication_identifier:
eissn:
- 2469-9969
issn:
- 2469-9950
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Diagrammatic Monte Carlo for electronic correlation in molecules: High-order
many-body perturbation theory with low scaling'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 108
year: '2023'
...
---
_id: '14650'
abstract:
- lang: eng
text: We study the out-of-equilibrium quantum dynamics of dipolar polarons, i.e.,
impurities immersed in a dipolar Bose-Einstein condensate, after a quench of the
impurity-boson interaction. We show that the dipolar nature of the condensate
and of the impurity results in anisotropic relaxation dynamics, in particular,
anisotropic dressing of the polaron. More relevantly for cold-atom setups, quench
dynamics is strongly affected by the interplay between dipolar anisotropy and
trap geometry. Our findings pave the way for simulating impurities in anisotropic
media utilizing experiments with dipolar mixtures.
acknowledgement: "We thank Lauriane Chomaz for useful discussions and comments on
the manuscript. We also\r\nthank Ragheed Al Hyder for comments on the manuscript.\r\nG.B.
acknowledges support from the Austrian Science Fund (FWF),\r\nunder Project No.
M2641-N27. This work is supported by the Deutsche Forschungsgemeinschaft (DFG, German
Research Foundation) under Germany’s Excellence Strategy EXC2181/1-\r\n390900948
(the Heidelberg STRUCTURES Excellence Cluster). A. G. V. acknowledges support from
the European Union’s Horizon 2020 research and innovation programme under the\r\nMarie
Skłodowska-Curie Grant Agreement No. 754411. L.A.P.A acknowledges by the PNRR\r\nMUR
project PE0000023 - NQSTI and the Deutsche Forschungsgemeinschaft (DFG, German\r\nResearch
Foundation) under Germany’s Excellence Strategy - EXC - 2123 Quantum Frontiers390837967
and FOR2247."
article_number: '232'
article_processing_charge: No
article_type: original
author:
- first_name: Artem
full_name: Volosniev, Artem
id: 37D278BC-F248-11E8-B48F-1D18A9856A87
last_name: Volosniev
orcid: 0000-0003-0393-5525
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: Luis
full_name: Santos, Luis
last_name: Santos
- first_name: Luisllu A.
full_name: Peña Ardila, Luisllu A.
last_name: Peña Ardila
citation:
ama: Volosniev A, Bighin G, Santos L, Peña Ardila LA. Non-equilibrium dynamics of
dipolar polarons. SciPost Physics. 2023;15(6). doi:10.21468/scipostphys.15.6.232
apa: Volosniev, A., Bighin, G., Santos, L., & Peña Ardila, L. A. (2023). Non-equilibrium
dynamics of dipolar polarons. SciPost Physics. SciPost Foundation. https://doi.org/10.21468/scipostphys.15.6.232
chicago: Volosniev, Artem, Giacomo Bighin, Luis Santos, and Luisllu A. Peña Ardila.
“Non-Equilibrium Dynamics of Dipolar Polarons.” SciPost Physics. SciPost
Foundation, 2023. https://doi.org/10.21468/scipostphys.15.6.232.
ieee: A. Volosniev, G. Bighin, L. Santos, and L. A. Peña Ardila, “Non-equilibrium
dynamics of dipolar polarons,” SciPost Physics, vol. 15, no. 6. SciPost
Foundation, 2023.
ista: Volosniev A, Bighin G, Santos L, Peña Ardila LA. 2023. Non-equilibrium dynamics
of dipolar polarons. SciPost Physics. 15(6), 232.
mla: Volosniev, Artem, et al. “Non-Equilibrium Dynamics of Dipolar Polarons.” SciPost
Physics, vol. 15, no. 6, 232, SciPost Foundation, 2023, doi:10.21468/scipostphys.15.6.232.
short: A. Volosniev, G. Bighin, L. Santos, L.A. Peña Ardila, SciPost Physics 15
(2023).
date_created: 2023-12-10T13:03:07Z
date_published: 2023-12-07T00:00:00Z
date_updated: 2023-12-11T07:44:08Z
day: '07'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.21468/scipostphys.15.6.232
ec_funded: 1
external_id:
arxiv:
- '2305.17969'
file:
- access_level: open_access
checksum: e664372a1fe9d628a9bb1d135ebab7d8
content_type: application/pdf
creator: dernst
date_created: 2023-12-11T07:42:04Z
date_updated: 2023-12-11T07:42:04Z
file_id: '14669'
file_name: 2023_SciPostPhysics_Volosniev.pdf
file_size: 3543541
relation: main_file
success: 1
file_date_updated: 2023-12-11T07:42:04Z
has_accepted_license: '1'
intvolume: ' 15'
issue: '6'
keyword:
- General Physics and Astronomy
language:
- iso: eng
month: '12'
oa: 1
oa_version: Published Version
project:
- _id: 26986C82-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: M02641
name: A path-integral approach to composite impurities
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
publication: SciPost Physics
publication_identifier:
issn:
- 2542-4653
publication_status: published
publisher: SciPost Foundation
quality_controlled: '1'
status: public
title: Non-equilibrium dynamics of dipolar polarons
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: 15
year: '2023'
...
---
_id: '11592'
abstract:
- lang: eng
text: 'We compare recent experimental results [Science 375, 528 (2022)] of the superfluid
unitary Fermi gas near the critical temperature with a thermodynamic model based
on the elementary excitations of the system. We find good agreement between experimental
data and our theory for several quantities such as first sound, second sound,
and superfluid fraction. We also show that mode mixing between first and second
sound occurs. Finally, we characterize the response amplitude to a density perturbation:
Close to the critical temperature both first and second sound can be excited through
a density perturbation, whereas at lower temperatures only the first sound mode
exhibits a significant response.'
acknowledgement: The authors gratefully acknowledge stimulating discussions with T.
Enss, and thank an anonymous referee for suggestions and remarks that allowed us
to improve the original manuscript. This work is supported by the Deutsche Forschungsgemeinschaft
(DFG, German Research Foundation) under Germany’s Excellence Strategy EXC2181/1-390900948
(the Heidelberg STRUCTURES Excellence Cluster).
article_number: '063329'
article_processing_charge: No
article_type: original
author:
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: Alberto
full_name: Cappellaro, Alberto
id: 9d13b3cb-30a2-11eb-80dc-f772505e8660
last_name: Cappellaro
orcid: 0000-0001-6110-2359
- first_name: L.
full_name: Salasnich, L.
last_name: Salasnich
citation:
ama: 'Bighin G, Cappellaro A, Salasnich L. Unitary Fermi superfluid near the critical
temperature: Thermodynamics and sound modes from elementary excitations. Physical
Review A. 2022;105(6). doi:10.1103/PhysRevA.105.063329'
apa: 'Bighin, G., Cappellaro, A., & Salasnich, L. (2022). Unitary Fermi superfluid
near the critical temperature: Thermodynamics and sound modes from elementary
excitations. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.105.063329'
chicago: 'Bighin, Giacomo, Alberto Cappellaro, and L. Salasnich. “Unitary Fermi
Superfluid near the Critical Temperature: Thermodynamics and Sound Modes from
Elementary Excitations.” Physical Review A. American Physical Society,
2022. https://doi.org/10.1103/PhysRevA.105.063329.'
ieee: 'G. Bighin, A. Cappellaro, and L. Salasnich, “Unitary Fermi superfluid near
the critical temperature: Thermodynamics and sound modes from elementary excitations,”
Physical Review A, vol. 105, no. 6. American Physical Society, 2022.'
ista: 'Bighin G, Cappellaro A, Salasnich L. 2022. Unitary Fermi superfluid near
the critical temperature: Thermodynamics and sound modes from elementary excitations.
Physical Review A. 105(6), 063329.'
mla: 'Bighin, Giacomo, et al. “Unitary Fermi Superfluid near the Critical Temperature:
Thermodynamics and Sound Modes from Elementary Excitations.” Physical Review
A, vol. 105, no. 6, 063329, American Physical Society, 2022, doi:10.1103/PhysRevA.105.063329.'
short: G. Bighin, A. Cappellaro, L. Salasnich, Physical Review A 105 (2022).
date_created: 2022-07-17T22:01:55Z
date_published: 2022-06-30T00:00:00Z
date_updated: 2023-08-03T12:00:11Z
day: '30'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.105.063329
external_id:
arxiv:
- '2206.03924'
isi:
- '000829758500010'
intvolume: ' 105'
isi: 1
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.2206.03924'
month: '06'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Unitary Fermi superfluid near the critical temperature: Thermodynamics and
sound modes from elementary excitations'
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 105
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.
New Journal of Physics. 2022;24(7). doi:10.1088/1367-2630/ac8113
apa: Cherepanov, I., Bighin, G., Schouder, C. A., Chatterley, A. S., Stapelfeldt,
H., & Lemeshko, M. (2022). A simple model for high rotational excitations
of molecules in a superfluid. New Journal of Physics. IOP. https://doi.org/10.1088/1367-2630/ac8113
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.” New Journal of Physics. IOP,
2022. https://doi.org/10.1088/1367-2630/ac8113.
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,” New Journal of Physics, vol. 24, no. 7. IOP, 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.” New Journal of Physics, vol. 24, no. 7, 075004,
IOP, 2022, doi:10.1088/1367-2630/ac8113.
short: I. Cherepanov, G. Bighin, C.A. Schouder, A.S. Chatterley, H. Stapelfeldt,
M. Lemeshko, New Journal of Physics 24 (2022).
date_created: 2022-08-28T22:02:01Z
date_published: 2022-08-11T00:00:00Z
date_updated: 2023-08-03T13:19:06Z
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
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: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 24
year: '2022'
...
---
_id: '11997'
abstract:
- lang: eng
text: "We study the fate of an impurity in an ultracold heteronuclear Bose mixture,
focusing on the experimentally relevant case of a ⁴¹K - ⁸⁷Rb mixture, with the
impurity in a ⁴¹K hyperfine state. Our paper provides a comprehensive description
of an impurity in a BEC mixture with contact interactions across its phase diagram.
We present results for the miscible and immiscible regimes, as well as for the
impurity in a self-bound quantum droplet. Here, varying the interactions, we find
exotic states where the impurity localizes either at the center or\r\nat the surface
of the droplet. "
acknowledgement: We thank A. Simoni for providing the calculations of the intercomponent
scattering lengths. We gratefully acknowledge stimulating discussions with L. A.
Peña Ardila, R. Schmidt, H. Silva, V. Zampronio, and M. Prevedelli for careful reading.
G.B. acknowledges support from the Austrian Science Fund (FWF) under Project No.
M2641-N27. T.M. acknowledges CNPq for support through Bolsa de produtividade em
Pesquisa No. 311079/2015-6. This work is supported by the Deutsche Forschungsgemeinschaft
(DFG, German Research Foundation) under Germany's Excellence Strategy No. EXC2181/1-390900948
(the Heidelberg STRUCTURES Excellence Cluster). This work was supported by the Serrapilheira
Institute (Grant No. Serra-1812-27802). We thank the High-Performance Computing
Center (NPAD) at UFRN for providing computational resources.
article_number: '023301'
article_processing_charge: No
article_type: original
author:
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: A.
full_name: Burchianti, A.
last_name: Burchianti
- first_name: F.
full_name: Minardi, F.
last_name: Minardi
- first_name: T.
full_name: Macrì, T.
last_name: Macrì
citation:
ama: Bighin G, Burchianti A, Minardi F, Macrì T. Impurity in a heteronuclear two-component
Bose mixture. Physical Review A. 2022;106(2). doi:10.1103/PhysRevA.106.023301
apa: Bighin, G., Burchianti, A., Minardi, F., & Macrì, T. (2022). Impurity in
a heteronuclear two-component Bose mixture. Physical Review A. American
Physical Society. https://doi.org/10.1103/PhysRevA.106.023301
chicago: Bighin, Giacomo, A. Burchianti, F. Minardi, and T. Macrì. “Impurity in
a Heteronuclear Two-Component Bose Mixture.” Physical Review A. American
Physical Society, 2022. https://doi.org/10.1103/PhysRevA.106.023301.
ieee: G. Bighin, A. Burchianti, F. Minardi, and T. Macrì, “Impurity in a heteronuclear
two-component Bose mixture,” Physical Review A, vol. 106, no. 2. American
Physical Society, 2022.
ista: Bighin G, Burchianti A, Minardi F, Macrì T. 2022. Impurity in a heteronuclear
two-component Bose mixture. Physical Review A. 106(2), 023301.
mla: Bighin, Giacomo, et al. “Impurity in a Heteronuclear Two-Component Bose Mixture.”
Physical Review A, vol. 106, no. 2, 023301, American Physical Society,
2022, doi:10.1103/PhysRevA.106.023301.
short: G. Bighin, A. Burchianti, F. Minardi, T. Macrì, Physical Review A 106 (2022).
date_created: 2022-08-28T22:02:00Z
date_published: 2022-08-04T00:00:00Z
date_updated: 2023-08-03T13:20:42Z
day: '04'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.106.023301
external_id:
arxiv:
- '2109.07451'
isi:
- '000837953600006'
intvolume: ' 106'
isi: 1
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2109.07451
month: '08'
oa: 1
oa_version: Preprint
project:
- _id: 26986C82-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: M02641
name: A path-integral approach to composite impurities
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Impurity in a heteronuclear two-component Bose mixture
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 106
year: '2022'
...
---
_id: '12154'
abstract:
- lang: eng
text: We review our theoretical results of the sound propagation in two-dimensional
(2D) systems of ultracold fermionic and bosonic atoms. In the superfluid phase,
characterized by the spontaneous symmetry breaking of the U(1) symmetry, there
is the coexistence of first and second sound. In the case of weakly-interacting
repulsive bosons, we model the recent measurements of the sound velocities of
39K atoms in 2D obtained in the weakly-interacting regime and around the Berezinskii–Kosterlitz–Thouless
(BKT) superfluid-to-normal transition temperature. In particular, we perform a
quite accurate computation of the superfluid density and show that it is reasonably
consistent with the experimental results. For superfluid attractive fermions,
we calculate the first and second sound velocities across the whole BCS-BEC crossover.
In the low-temperature regime, we reproduce the recent measurements of first-sound
speed with 6Li atoms. We also predict that there is mixing between sound modes
only in the finite-temperature BEC regime.
acknowledgement: "This research is partially supported by University of Padova, BIRD
grant “Ultracold atoms\r\nin curved geometries”. KF is supported by Fondazione CARIPARO
with a PhD fellowship. AT is\r\npartially supported by French National Research
Agency ANR Grant Droplets N. ANR-19-CE30-0003-02. LS thanks Herwig Ott and Sandro
Wimberger for their kind invitation to the\r\nInternational Workshop “Quantum Transport
with ultracold atoms” (2022)."
article_number: '2182'
article_processing_charge: Yes
article_type: original
author:
- first_name: Luca
full_name: Salasnich, Luca
last_name: Salasnich
- first_name: Alberto
full_name: Cappellaro, Alberto
id: 9d13b3cb-30a2-11eb-80dc-f772505e8660
last_name: Cappellaro
orcid: 0000-0001-6110-2359
- first_name: Koichiro
full_name: Furutani, Koichiro
last_name: Furutani
- first_name: Andrea
full_name: Tononi, Andrea
last_name: Tononi
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
citation:
ama: Salasnich L, Cappellaro A, Furutani K, Tononi A, Bighin G. First and second
sound in two-dimensional bosonic and fermionic superfluids. Symmetry. 2022;14(10).
doi:10.3390/sym14102182
apa: Salasnich, L., Cappellaro, A., Furutani, K., Tononi, A., & Bighin, G. (2022).
First and second sound in two-dimensional bosonic and fermionic superfluids. Symmetry.
MDPI. https://doi.org/10.3390/sym14102182
chicago: Salasnich, Luca, Alberto Cappellaro, Koichiro Furutani, Andrea Tononi,
and Giacomo Bighin. “First and Second Sound in Two-Dimensional Bosonic and Fermionic
Superfluids.” Symmetry. MDPI, 2022. https://doi.org/10.3390/sym14102182.
ieee: L. Salasnich, A. Cappellaro, K. Furutani, A. Tononi, and G. Bighin, “First
and second sound in two-dimensional bosonic and fermionic superfluids,” Symmetry,
vol. 14, no. 10. MDPI, 2022.
ista: Salasnich L, Cappellaro A, Furutani K, Tononi A, Bighin G. 2022. First and
second sound in two-dimensional bosonic and fermionic superfluids. Symmetry. 14(10),
2182.
mla: Salasnich, Luca, et al. “First and Second Sound in Two-Dimensional Bosonic
and Fermionic Superfluids.” Symmetry, vol. 14, no. 10, 2182, MDPI, 2022,
doi:10.3390/sym14102182.
short: L. Salasnich, A. Cappellaro, K. Furutani, A. Tononi, G. Bighin, Symmetry
14 (2022).
date_created: 2023-01-12T12:08:31Z
date_published: 2022-10-17T00:00:00Z
date_updated: 2023-08-09T10:13:17Z
day: '17'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.3390/sym14102182
external_id:
isi:
- '000875039200001'
file:
- access_level: open_access
checksum: 9b6bd0e484834dd76d7b26e3c5fba8bd
content_type: application/pdf
creator: dernst
date_created: 2023-01-24T10:56:12Z
date_updated: 2023-01-24T10:56:12Z
file_id: '12361'
file_name: 2022_Symmetry_Salsnich.pdf
file_size: 843723
relation: main_file
success: 1
file_date_updated: 2023-01-24T10:56:12Z
has_accepted_license: '1'
intvolume: ' 14'
isi: 1
issue: '10'
keyword:
- Physics and Astronomy (miscellaneous)
- General Mathematics
- Chemistry (miscellaneous)
- Computer Science (miscellaneous)
language:
- iso: eng
month: '10'
oa: 1
oa_version: Published Version
publication: Symmetry
publication_identifier:
issn:
- 2073-8994
publication_status: published
publisher: MDPI
quality_controlled: '1'
scopus_import: '1'
status: public
title: First and second sound in two-dimensional bosonic and fermionic superfluids
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: 14
year: '2022'
...
---
_id: '9606'
abstract:
- lang: eng
text: Sound propagation is a macroscopic manifestation of the interplay between
the equilibrium thermodynamics and the dynamical transport properties of fluids.
Here, for a two-dimensional system of ultracold fermions, we calculate the first
and second sound velocities across the whole BCS-BEC crossover, and we analyze
the system response to an external perturbation. In the low-temperature regime
we reproduce the recent measurements [Phys. Rev. Lett. 124, 240403 (2020)] of
the first sound velocity, which, due to the decoupling of density and entropy
fluctuations, is the sole mode excited by a density probe. Conversely, a heat
perturbation excites only the second sound, which, being sensitive to the superfluid
depletion, vanishes in the deep BCS regime and jumps discontinuously to zero at
the Berezinskii-Kosterlitz-Thouless superfluid transition. A mixing between the
modes occurs only in the finite-temperature BEC regime, where our theory converges
to the purely bosonic results.
acknowledgement: "G.B. acknowledges support from the Austrian Science Fund (FWF),
under Project No. M2641-N27. This work was\r\npartially supported by the University
of Padua, BIRD project “Superfluid properties of Fermi gases in optical potentials.”\r\nThe
authors thank Miki Ota, Tomoki Ozawa, Sandro Stringari, Tilman Enss, Hauke Biss,
Henning Moritz, and Nicolò Defenu for fruitful discussions. The authors thank Henning
Moritz and Markus Bohlen for providing their experimental\r\ndata."
article_number: L061303
article_processing_charge: No
article_type: letter_note
author:
- first_name: A.
full_name: Tononi, A.
last_name: Tononi
- first_name: Alberto
full_name: Cappellaro, Alberto
id: 9d13b3cb-30a2-11eb-80dc-f772505e8660
last_name: Cappellaro
orcid: 0000-0001-6110-2359
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: L.
full_name: Salasnich, L.
last_name: Salasnich
citation:
ama: Tononi A, Cappellaro A, Bighin G, Salasnich L. Propagation of first and second
sound in a two-dimensional Fermi superfluid. Physical Review A. 2021;103(6).
doi:10.1103/PhysRevA.103.L061303
apa: Tononi, A., Cappellaro, A., Bighin, G., & Salasnich, L. (2021). Propagation
of first and second sound in a two-dimensional Fermi superfluid. Physical Review
A. American Physical Society. https://doi.org/10.1103/PhysRevA.103.L061303
chicago: Tononi, A., Alberto Cappellaro, Giacomo Bighin, and L. Salasnich. “Propagation
of First and Second Sound in a Two-Dimensional Fermi Superfluid.” Physical
Review A. American Physical Society, 2021. https://doi.org/10.1103/PhysRevA.103.L061303.
ieee: A. Tononi, A. Cappellaro, G. Bighin, and L. Salasnich, “Propagation of first
and second sound in a two-dimensional Fermi superfluid,” Physical Review A,
vol. 103, no. 6. American Physical Society, 2021.
ista: Tononi A, Cappellaro A, Bighin G, Salasnich L. 2021. Propagation of first
and second sound in a two-dimensional Fermi superfluid. Physical Review A. 103(6),
L061303.
mla: Tononi, A., et al. “Propagation of First and Second Sound in a Two-Dimensional
Fermi Superfluid.” Physical Review A, vol. 103, no. 6, L061303, American
Physical Society, 2021, doi:10.1103/PhysRevA.103.L061303.
short: A. Tononi, A. Cappellaro, G. Bighin, L. Salasnich, Physical Review A 103
(2021).
date_created: 2021-06-27T22:01:49Z
date_published: 2021-06-01T00:00:00Z
date_updated: 2023-08-10T13:37:25Z
day: '01'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.103.L061303
external_id:
arxiv:
- '2009.06491'
isi:
- '000662296700014'
intvolume: ' 103'
isi: 1
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2009.06491
month: '06'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
eissn:
- '24699934'
issn:
- '24699926'
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Propagation of first and second sound in a two-dimensional Fermi superfluid
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 103
year: '2021'
...
---
_id: '10631'
abstract:
- lang: eng
text: We combine experimental and theoretical approaches to explore excited rotational
states of molecules embedded in helium nanodroplets using CS2 and I2 as examples.
Laser-induced nonadiabatic molecular alignment is employed to measure spectral
lines for rotational states extending beyond those initially populated at the
0.37 K droplet temperature. We construct a simple quantum-mechanical model, based
on a linear rotor coupled to a single-mode bosonic bath, to determine the rotational
energy structure in its entirety. The calculated and measured spectral lines are
in good agreement. We show that the effect of the surrounding superfluid on molecular
rotation can be rationalized by a single quantity, the angular momentum, transferred
from the molecule to the droplet.
acknowledgement: I.C. acknowledges the support by the European Union’s Horizon 2020
research and innovation programme under the Marie Sklodowska-Curie Grant Agreement
No. 665385. G.B. acknowledges support from the Austrian Science Fund (FWF), under
project No. M2461-N27. M.L. 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). H.S acknowledges support from the European Research
Council-AdG (Project No. 320459, DropletControl) and from The Villum Foundation
through a Villum Investigator grant no. 25886.
article_number: L061303
article_processing_charge: No
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: Simon H.
full_name: Albrechtsen, Simon H.
last_name: Albrechtsen
- first_name: Alberto Viñas
full_name: Muñoz, Alberto Viñas
last_name: Muñoz
- first_name: Lars
full_name: Christiansen, Lars
last_name: Christiansen
- 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, et al. Excited rotational states of molecules
in a superfluid. Physical Review A. 2021;104(6). doi:10.1103/PhysRevA.104.L061303
apa: Cherepanov, I., Bighin, G., Schouder, C. A., Chatterley, A. S., Albrechtsen,
S. H., Muñoz, A. V., … Lemeshko, M. (2021). Excited rotational states of molecules
in a superfluid. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.104.L061303
chicago: Cherepanov, Igor, Giacomo Bighin, Constant A. Schouder, Adam S. Chatterley,
Simon H. Albrechtsen, Alberto Viñas Muñoz, Lars Christiansen, Henrik Stapelfeldt,
and Mikhail Lemeshko. “Excited Rotational States of Molecules in a Superfluid.”
Physical Review A. American Physical Society, 2021. https://doi.org/10.1103/PhysRevA.104.L061303.
ieee: I. Cherepanov et al., “Excited rotational states of molecules in a
superfluid,” Physical Review A, vol. 104, no. 6. American Physical Society,
2021.
ista: Cherepanov I, Bighin G, Schouder CA, Chatterley AS, Albrechtsen SH, Muñoz
AV, Christiansen L, Stapelfeldt H, Lemeshko M. 2021. Excited rotational states
of molecules in a superfluid. Physical Review A. 104(6), L061303.
mla: Cherepanov, Igor, et al. “Excited Rotational States of Molecules in a Superfluid.”
Physical Review A, vol. 104, no. 6, L061303, American Physical Society,
2021, doi:10.1103/PhysRevA.104.L061303.
short: I. Cherepanov, G. Bighin, C.A. Schouder, A.S. Chatterley, S.H. Albrechtsen,
A.V. Muñoz, L. Christiansen, H. Stapelfeldt, M. Lemeshko, Physical Review A 104
(2021).
date_created: 2022-01-16T23:01:29Z
date_published: 2021-12-30T00:00:00Z
date_updated: 2023-08-17T06:52:17Z
day: '30'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.104.L061303
ec_funded: 1
external_id:
arxiv:
- '2107.00468'
isi:
- '000739618300001'
intvolume: ' 104'
isi: 1
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://128.84.4.18/abs/2107.00468
month: '12'
oa: 1
oa_version: Preprint
project:
- _id: 26031614-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P29902
name: Quantum rotations in the presence of a many-body environment
- _id: 2688CF98-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '801770'
name: 'Angulon: physics and applications of a new quasiparticle'
- _id: 2564DBCA-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '665385'
name: International IST Doctoral Program
- _id: 26986C82-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: M02641
name: A path-integral approach to composite impurities
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Excited rotational states of molecules in a superfluid
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 104
year: '2021'
...
---
_id: '8170'
abstract:
- lang: eng
text: "Alignment of OCS, CS2, and I2 molecules embedded in helium nanodroplets is
measured as a function\r\nof time following rotational excitation by a nonresonant,
comparatively weak ps laser pulse. The distinct\r\npeaks in the power spectra,
obtained by Fourier analysis, are used to determine the rotational, B, and\r\ncentrifugal
distortion, D, constants. For OCS, B and D match the values known from IR spectroscopy.
For\r\nCS2 and I2, they are the first experimental results reported. The alignment
dynamics calculated from the\r\ngas-phase rotational Schrödinger equation, using
the experimental in-droplet B and D values, agree in\r\ndetail with the measurement
for all three molecules. The rotational spectroscopy technique for molecules in\r\nhelium
droplets introduced here should apply to a range of molecules and complexes."
acknowledgement: "H. S. acknowledges support from the European Research Council-AdG
(Project No. 320459, DropletControl)\r\nand from The Villum Foundation through a
Villum Investigator Grant No. 25886. M. L. acknowledges support\r\nby the Austrian
Science Fund (FWF), under Project No. P29902-N27, and by the European Research Council\r\n(ERC)
Starting Grant No. 801770 (ANGULON). G. B. acknowledges support from the Austrian
Science Fund\r\n(FWF), under Project No. M2641-N27. I. C. acknowledges support by
the European Union’s Horizon 2020 research and\r\ninnovation programme under the
Marie Skłodowska-Curie Grant Agreement No. 665385. Computational resources for\r\nthe
PIMC simulations were provided by the division for scientific computing at the Johannes
Kepler University."
article_number: '013001'
article_processing_charge: No
article_type: original
author:
- first_name: Adam S.
full_name: Chatterley, Adam S.
last_name: Chatterley
- first_name: Lars
full_name: Christiansen, Lars
last_name: Christiansen
- first_name: Constant A.
full_name: Schouder, Constant A.
last_name: Schouder
- first_name: Anders V.
full_name: Jørgensen, Anders V.
last_name: Jørgensen
- first_name: Benjamin
full_name: Shepperson, Benjamin
last_name: Shepperson
- 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: Robert E.
full_name: Zillich, Robert E.
last_name: Zillich
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
- first_name: Henrik
full_name: Stapelfeldt, Henrik
last_name: Stapelfeldt
citation:
ama: 'Chatterley AS, Christiansen L, Schouder CA, et al. Rotational coherence spectroscopy
of molecules in Helium nanodroplets: Reconciling the time and the frequency domains.
Physical Review Letters. 2020;125(1). doi:10.1103/PhysRevLett.125.013001'
apa: 'Chatterley, A. S., Christiansen, L., Schouder, C. A., Jørgensen, A. V., Shepperson,
B., Cherepanov, I., … Stapelfeldt, H. (2020). Rotational coherence spectroscopy
of molecules in Helium nanodroplets: Reconciling the time and the frequency domains.
Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.125.013001'
chicago: 'Chatterley, Adam S., Lars Christiansen, Constant A. Schouder, Anders V.
Jørgensen, Benjamin Shepperson, Igor Cherepanov, Giacomo Bighin, Robert E. Zillich,
Mikhail Lemeshko, and Henrik Stapelfeldt. “Rotational Coherence Spectroscopy of
Molecules in Helium Nanodroplets: Reconciling the Time and the Frequency Domains.”
Physical Review Letters. American Physical Society, 2020. https://doi.org/10.1103/PhysRevLett.125.013001.'
ieee: 'A. S. Chatterley et al., “Rotational coherence spectroscopy of molecules
in Helium nanodroplets: Reconciling the time and the frequency domains,” Physical
Review Letters, vol. 125, no. 1. American Physical Society, 2020.'
ista: 'Chatterley AS, Christiansen L, Schouder CA, Jørgensen AV, Shepperson B, Cherepanov
I, Bighin G, Zillich RE, Lemeshko M, Stapelfeldt H. 2020. Rotational coherence
spectroscopy of molecules in Helium nanodroplets: Reconciling the time and the
frequency domains. Physical Review Letters. 125(1), 013001.'
mla: 'Chatterley, Adam S., et al. “Rotational Coherence Spectroscopy of Molecules
in Helium Nanodroplets: Reconciling the Time and the Frequency Domains.” Physical
Review Letters, vol. 125, no. 1, 013001, American Physical Society, 2020,
doi:10.1103/PhysRevLett.125.013001.'
short: A.S. Chatterley, L. Christiansen, C.A. Schouder, A.V. Jørgensen, B. Shepperson,
I. Cherepanov, G. Bighin, R.E. Zillich, M. Lemeshko, H. Stapelfeldt, Physical
Review Letters 125 (2020).
date_created: 2020-07-26T22:01:02Z
date_published: 2020-07-03T00:00:00Z
date_updated: 2023-08-22T08:22:43Z
day: '03'
department:
- _id: MiLe
doi: 10.1103/PhysRevLett.125.013001
ec_funded: 1
external_id:
arxiv:
- '2006.02694'
isi:
- '000544526900006'
intvolume: ' 125'
isi: 1
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2006.02694
month: '07'
oa: 1
oa_version: Preprint
project:
- _id: 26031614-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P29902
name: Quantum rotations in the presence of a many-body environment
- _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
- _id: 2564DBCA-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '665385'
name: International IST Doctoral Program
publication: Physical Review Letters
publication_identifier:
eissn:
- '10797114'
issn:
- '00319007'
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Rotational coherence spectroscopy of molecules in Helium nanodroplets: Reconciling
the time and the frequency domains'
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 125
year: '2020'
...
---
_id: '8587'
abstract:
- lang: eng
text: Inspired by the possibility to experimentally manipulate and enhance chemical
reactivity in helium nanodroplets, we investigate the effective interaction and
the resulting correlations between two diatomic molecules immersed in a bath of
bosons. By analogy with the bipolaron, we introduce the biangulon quasiparticle
describing two rotating molecules that align with respect to each other due to
the effective attractive interaction mediated by the excitations of the bath.
We study this system in different parameter regimes and apply several theoretical
approaches to describe its properties. Using a Born–Oppenheimer approximation,
we investigate the dependence of the effective intermolecular interaction on the
rotational state of the two molecules. In the strong-coupling regime, a product-state
ansatz shows that the molecules tend to have a strong alignment in the ground
state. To investigate the system in the weak-coupling regime, we apply a one-phonon
excitation variational ansatz, which allows us to access the energy spectrum.
In comparison to the angulon quasiparticle, the biangulon shows shifted angulon
instabilities and an additional spectral instability, where resonant angular momentum
transfer between the molecules and the bath takes place. These features are proposed
as an experimentally observable signature for the formation of the biangulon quasiparticle.
Finally, by using products of single angulon and bare impurity wave functions
as basis states, we introduce a diagonalization scheme that allows us to describe
the transition from two separated angulons to a biangulon as a function of the
distance between the two molecules.
acknowledgement: We are grateful to Areg Ghazaryan for valuable discussions. M.L.
acknowledges support from the Austrian Science Fund (FWF) under Project No. P29902-N27
and from the European Research Council (ERC) Starting Grant No. 801770 (ANGULON).
G.B. acknowledges support from the Austrian Science Fund (FWF) under Project No.
M2461-N27. A.D. acknowledges funding from the European Union’s Horizon 2020 research
and innovation programme under the European Research Council (ERC) Grant Agreement
No. 694227 and under the Marie Sklodowska-Curie Grant Agreement No. 836146. R.S.
was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)
under Germany’s Excellence Strategy – EXC-2111 – 390814868.
article_number: '164302'
article_processing_charge: No
article_type: original
author:
- first_name: Xiang
full_name: Li, Xiang
id: 4B7E523C-F248-11E8-B48F-1D18A9856A87
last_name: Li
- first_name: Enderalp
full_name: Yakaboylu, Enderalp
id: 38CB71F6-F248-11E8-B48F-1D18A9856A87
last_name: Yakaboylu
orcid: 0000-0001-5973-0874
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: Richard
full_name: Schmidt, Richard
last_name: Schmidt
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
- first_name: Andreas
full_name: Deuchert, Andreas
id: 4DA65CD0-F248-11E8-B48F-1D18A9856A87
last_name: Deuchert
orcid: 0000-0003-3146-6746
citation:
ama: Li X, Yakaboylu E, Bighin G, Schmidt R, Lemeshko M, Deuchert A. Intermolecular
forces and correlations mediated by a phonon bath. The Journal of Chemical
Physics. 2020;152(16). doi:10.1063/1.5144759
apa: Li, X., Yakaboylu, E., Bighin, G., Schmidt, R., Lemeshko, M., & Deuchert,
A. (2020). Intermolecular forces and correlations mediated by a phonon bath. The
Journal of Chemical Physics. AIP Publishing. https://doi.org/10.1063/1.5144759
chicago: Li, Xiang, Enderalp Yakaboylu, Giacomo Bighin, Richard Schmidt, Mikhail
Lemeshko, and Andreas Deuchert. “Intermolecular Forces and Correlations Mediated
by a Phonon Bath.” The Journal of Chemical Physics. AIP Publishing, 2020.
https://doi.org/10.1063/1.5144759.
ieee: X. Li, E. Yakaboylu, G. Bighin, R. Schmidt, M. Lemeshko, and A. Deuchert,
“Intermolecular forces and correlations mediated by a phonon bath,” The Journal
of Chemical Physics, vol. 152, no. 16. AIP Publishing, 2020.
ista: Li X, Yakaboylu E, Bighin G, Schmidt R, Lemeshko M, Deuchert A. 2020. Intermolecular
forces and correlations mediated by a phonon bath. The Journal of Chemical Physics.
152(16), 164302.
mla: Li, Xiang, et al. “Intermolecular Forces and Correlations Mediated by a Phonon
Bath.” The Journal of Chemical Physics, vol. 152, no. 16, 164302, AIP Publishing,
2020, doi:10.1063/1.5144759.
short: X. Li, E. Yakaboylu, G. Bighin, R. Schmidt, M. Lemeshko, A. Deuchert, The
Journal of Chemical Physics 152 (2020).
date_created: 2020-09-30T10:33:17Z
date_published: 2020-04-27T00:00:00Z
date_updated: 2023-09-07T13:16:42Z
day: '27'
department:
- _id: MiLe
- _id: RoSe
doi: 10.1063/1.5144759
ec_funded: 1
external_id:
arxiv:
- '1912.02658'
isi:
- '000530448300001'
intvolume: ' 152'
isi: 1
issue: '16'
keyword:
- Physical and Theoretical Chemistry
- General Physics and Astronomy
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1912.02658
month: '04'
oa: 1
oa_version: Preprint
project:
- _id: 26031614-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P29902
name: Quantum rotations in the presence of a many-body environment
- _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
- _id: 25C6DC12-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '694227'
name: Analysis of quantum many-body systems
publication: The Journal of Chemical Physics
publication_identifier:
eissn:
- 1089-7690
issn:
- 0021-9606
publication_status: published
publisher: AIP Publishing
quality_controlled: '1'
related_material:
record:
- id: '8958'
relation: dissertation_contains
status: public
status: public
title: Intermolecular forces and correlations mediated by a phonon bath
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 152
year: '2020'
...
---
_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. New Journal of Physics.
2020;22(9). doi:10.1088/1367-2630/abae44
apa: Rzadkowski, W., Defenu, N., Chiacchiera, S., Trombettoni, A., & Bighin,
G. (2020). Detecting composite orders in layered models via machine learning.
New Journal of Physics. IOP Publishing. https://doi.org/10.1088/1367-2630/abae44
chicago: Rzadkowski, Wojciech, N Defenu, S Chiacchiera, A Trombettoni, and Giacomo
Bighin. “Detecting Composite Orders in Layered Models via Machine Learning.” New
Journal of Physics. IOP Publishing, 2020. https://doi.org/10.1088/1367-2630/abae44.
ieee: W. Rzadkowski, N. Defenu, S. Chiacchiera, A. Trombettoni, and G. Bighin, “Detecting
composite orders in layered models via machine learning,” New Journal of Physics,
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.” New Journal of Physics, vol. 22, no. 9, 093026,
IOP Publishing, 2020, doi:10.1088/1367-2630/abae44.
short: W. Rzadkowski, N. Defenu, S. Chiacchiera, A. Trombettoni, G. Bighin, New
Journal of Physics 22 (2020).
date_created: 2020-10-11T22:01:14Z
date_published: 2020-09-01T00:00:00Z
date_updated: 2023-09-07T13:44:16Z
day: '01'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1088/1367-2630/abae44
ec_funded: 1
external_id:
isi:
- '000573298000001'
file:
- access_level: open_access
checksum: c9238fff422e7a957c3a0d559f756b3a
content_type: application/pdf
creator: dernst
date_created: 2020-10-12T12:18:47Z
date_updated: 2020-10-12T12:18:47Z
file_id: '8650'
file_name: 2020_NewJournalPhysics_Rzdkowski.pdf
file_size: 2725143
relation: main_file
success: 1
file_date_updated: 2020-10-12T12:18:47Z
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:
- '13672630'
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
related_material:
record:
- id: '10759'
relation: dissertation_contains
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: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 22
year: '2020'
...
---
_id: '6940'
abstract:
- lang: eng
text: "We study the effect of a linear tunneling coupling between two-dimensional
systems, each separately\r\nexhibiting the topological Berezinskii-Kosterlitz-Thouless
(BKT) transition. In the uncoupled limit, there\r\nare two phases: one where the
one-body correlation functions are algebraically decaying and the other with\r\nexponential
decay. When the linear coupling is turned on, a third BKT-paired phase emerges,
in which one-body correlations are exponentially decaying, while two-body correlation
functions exhibit power-law\r\ndecay. We perform numerical simulations in the
paradigmatic case of two coupled XY models at finite\r\ntemperature, finding evidences
that for any finite value of the interlayer coupling, the BKT-paired phase is\r\npresent.
We provide a picture of the phase diagram using a renormalization group approach."
acknowledgement: "We thank S. Chiacchiera, G. Delfino, N. Dupuis, T. Enss, M. Fabrizio
and G. Gori for many stimulating discussions.\r\nG.B. acknowledges support from
the Austrian Science Fund (FWF), under project No. M2461-N27. N.D. acknowledges\r\nsupport
from Deutsche Forschungsgemeinschaft (DFG) under Germany’s Excellence Strategy EXC-2181/1
- 390900948 (the Heidelberg STRUCTURES Excellence Cluster) and from the DFG Collaborative
Research Centre “SFB 1225 ISOQUANT”. Support from the CNR/MTA Italy-Hungary 2019-2021
Joint Project “Strongly interacting systems in confined geometries” is gratefully
acknowledged."
article_number: '100601'
article_processing_charge: No
article_type: original
author:
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: Nicolò
full_name: Defenu, Nicolò
last_name: Defenu
- first_name: István
full_name: Nándori, István
last_name: Nándori
- first_name: Luca
full_name: Salasnich, Luca
last_name: Salasnich
- first_name: Andrea
full_name: Trombettoni, Andrea
last_name: Trombettoni
citation:
ama: Bighin G, Defenu N, Nándori I, Salasnich L, Trombettoni A. Berezinskii-Kosterlitz-Thouless
paired phase in coupled XY models. Physical Review Letters. 2019;123(10).
doi:10.1103/physrevlett.123.100601
apa: Bighin, G., Defenu, N., Nándori, I., Salasnich, L., & Trombettoni, A. (2019).
Berezinskii-Kosterlitz-Thouless paired phase in coupled XY models. Physical
Review Letters. American Physical Society. https://doi.org/10.1103/physrevlett.123.100601
chicago: Bighin, Giacomo, Nicolò Defenu, István Nándori, Luca Salasnich, and Andrea
Trombettoni. “Berezinskii-Kosterlitz-Thouless Paired Phase in Coupled XY Models.”
Physical Review Letters. American Physical Society, 2019. https://doi.org/10.1103/physrevlett.123.100601.
ieee: G. Bighin, N. Defenu, I. Nándori, L. Salasnich, and A. Trombettoni, “Berezinskii-Kosterlitz-Thouless
paired phase in coupled XY models,” Physical Review Letters, vol. 123,
no. 10. American Physical Society, 2019.
ista: Bighin G, Defenu N, Nándori I, Salasnich L, Trombettoni A. 2019. Berezinskii-Kosterlitz-Thouless
paired phase in coupled XY models. Physical Review Letters. 123(10), 100601.
mla: Bighin, Giacomo, et al. “Berezinskii-Kosterlitz-Thouless Paired Phase in Coupled
XY Models.” Physical Review Letters, vol. 123, no. 10, 100601, American
Physical Society, 2019, doi:10.1103/physrevlett.123.100601.
short: G. Bighin, N. Defenu, I. Nándori, L. Salasnich, A. Trombettoni, Physical
Review Letters 123 (2019).
date_created: 2019-10-14T06:31:13Z
date_published: 2019-09-06T00:00:00Z
date_updated: 2023-08-30T06:57:53Z
day: '06'
department:
- _id: MiLe
doi: 10.1103/physrevlett.123.100601
external_id:
arxiv:
- '1907.06253'
isi:
- '000483587200004'
intvolume: ' 123'
isi: 1
issue: '10'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1907.06253
month: '09'
oa: 1
oa_version: Preprint
project:
- _id: 26986C82-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: M02641
name: A path-integral approach to composite impurities
publication: Physical Review Letters
publication_identifier:
eissn:
- 1079-7114
issn:
- 0031-9007
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
related_material:
link:
- description: News auf IST Website
relation: press_release
url: https://ist.ac.at/en/news/new-form-of-magnetism-found/
scopus_import: '1'
status: public
title: Berezinskii-Kosterlitz-Thouless paired phase in coupled XY models
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 123
year: '2019'
...
---
_id: '5886'
abstract:
- lang: eng
text: Problems involving quantum impurities, in which one or a few particles are
interacting with a macroscopic environment, represent a pervasive paradigm, spanning
across atomic, molecular, and condensed-matter physics. In this paper we introduce
new variational approaches to quantum impurities and apply them to the Fröhlich
polaron–a quasiparticle formed out of an electron (or other point-like impurity)
in a polar medium, and to the angulon–a quasiparticle formed out of a rotating
molecule in a bosonic bath. We benchmark these approaches against established
theories, evaluating their accuracy as a function of the impurity-bath coupling.
article_processing_charge: No
author:
- first_name: Xiang
full_name: Li, Xiang
id: 4B7E523C-F248-11E8-B48F-1D18A9856A87
last_name: Li
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: Enderalp
full_name: Yakaboylu, Enderalp
id: 38CB71F6-F248-11E8-B48F-1D18A9856A87
last_name: Yakaboylu
orcid: 0000-0001-5973-0874
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
citation:
ama: 'Li X, Bighin G, Yakaboylu E, Lemeshko M. Variational approaches to quantum
impurities: from the Fröhlich polaron to the angulon. Molecular Physics.
2019. doi:10.1080/00268976.2019.1567852'
apa: 'Li, X., Bighin, G., Yakaboylu, E., & Lemeshko, M. (2019). Variational
approaches to quantum impurities: from the Fröhlich polaron to the angulon. Molecular
Physics. Taylor and Francis. https://doi.org/10.1080/00268976.2019.1567852'
chicago: 'Li, Xiang, Giacomo Bighin, Enderalp Yakaboylu, and Mikhail Lemeshko. “Variational
Approaches to Quantum Impurities: From the Fröhlich Polaron to the Angulon.” Molecular
Physics. Taylor and Francis, 2019. https://doi.org/10.1080/00268976.2019.1567852.'
ieee: 'X. Li, G. Bighin, E. Yakaboylu, and M. Lemeshko, “Variational approaches
to quantum impurities: from the Fröhlich polaron to the angulon,” Molecular
Physics. Taylor and Francis, 2019.'
ista: 'Li X, Bighin G, Yakaboylu E, Lemeshko M. 2019. Variational approaches to
quantum impurities: from the Fröhlich polaron to the angulon. Molecular Physics.'
mla: 'Li, Xiang, et al. “Variational Approaches to Quantum Impurities: From the
Fröhlich Polaron to the Angulon.” Molecular Physics, Taylor and Francis,
2019, doi:10.1080/00268976.2019.1567852.'
short: X. Li, G. Bighin, E. Yakaboylu, M. Lemeshko, Molecular Physics (2019).
date_created: 2019-01-27T22:59:10Z
date_published: 2019-01-18T00:00:00Z
date_updated: 2023-09-07T13:16:42Z
day: '18'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1080/00268976.2019.1567852
ec_funded: 1
external_id:
isi:
- '000474641400008'
file:
- access_level: open_access
checksum: 178964744b636a6f036372f4f090a657
content_type: application/pdf
creator: dernst
date_created: 2019-01-29T08:32:57Z
date_updated: 2020-07-14T12:47:13Z
file_id: '5896'
file_name: 2019_MolecularPhysics_Li.pdf
file_size: 1309966
relation: main_file
file_date_updated: 2020-07-14T12:47:13Z
has_accepted_license: '1'
isi: 1
language:
- iso: eng
month: '01'
oa: 1
oa_version: Published Version
project:
- _id: 26031614-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P29902
name: Quantum rotations in the presence of a many-body environment
- _id: 25681D80-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '291734'
name: International IST Postdoc Fellowship Programme
publication: Molecular Physics
publication_identifier:
issn:
- '00268976'
publication_status: published
publisher: Taylor and Francis
quality_controlled: '1'
related_material:
record:
- id: '8958'
relation: dissertation_contains
status: public
scopus_import: '1'
status: public
title: 'Variational approaches to quantum impurities: from the Fröhlich polaron to
the angulon'
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
year: '2019'
...
---
_id: '420'
abstract:
- lang: eng
text: We analyze the theoretical derivation of the beyond-mean-field equation of
state for two-dimensional gas of dilute, ultracold alkali-metal atoms in the Bardeen–Cooper–Schrieffer
(BCS) to Bose–Einstein condensate (BEC) crossover. We show that at zero temperature
our theory — considering Gaussian fluctuations on top of the mean-field equation
of state — is in very good agreement with experimental data. Subsequently, we
investigate the superfluid density at finite temperature and its renormalization
due to the proliferation of vortex–antivortex pairs. By doing so, we determine
the Berezinskii–Kosterlitz–Thouless (BKT) critical temperature — at which the
renormalized superfluid density jumps to zero — as a function of the inter-atomic
potential strength. We find that the Nelson–Kosterlitz criterion overestimates
the BKT temperature with respect to the renormalization group equations, this
effect being particularly relevant in the intermediate regime of the crossover.
article_processing_charge: No
author:
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: Luca
full_name: Salasnich, Luca
last_name: Salasnich
citation:
ama: Bighin G, Salasnich L. Renormalization of the superfluid density in the two-dimensional
BCS-BEC crossover. International Journal of Modern Physics B. 2018;32(17):1840022.
doi:10.1142/S0217979218400222
apa: Bighin, G., & Salasnich, L. (2018). Renormalization of the superfluid density
in the two-dimensional BCS-BEC crossover. International Journal of Modern Physics
B. World Scientific Publishing. https://doi.org/10.1142/S0217979218400222
chicago: Bighin, Giacomo, and Luca Salasnich. “Renormalization of the Superfluid
Density in the Two-Dimensional BCS-BEC Crossover.” International Journal of
Modern Physics B. World Scientific Publishing, 2018. https://doi.org/10.1142/S0217979218400222.
ieee: G. Bighin and L. Salasnich, “Renormalization of the superfluid density in
the two-dimensional BCS-BEC crossover,” International Journal of Modern Physics
B, vol. 32, no. 17. World Scientific Publishing, p. 1840022, 2018.
ista: Bighin G, Salasnich L. 2018. Renormalization of the superfluid density in
the two-dimensional BCS-BEC crossover. International Journal of Modern Physics
B. 32(17), 1840022.
mla: Bighin, Giacomo, and Luca Salasnich. “Renormalization of the Superfluid Density
in the Two-Dimensional BCS-BEC Crossover.” International Journal of Modern
Physics B, vol. 32, no. 17, World Scientific Publishing, 2018, p. 1840022,
doi:10.1142/S0217979218400222.
short: G. Bighin, L. Salasnich, International Journal of Modern Physics B 32 (2018)
1840022.
date_created: 2018-12-11T11:46:22Z
date_published: 2018-07-10T00:00:00Z
date_updated: 2023-09-18T08:09:59Z
day: '10'
department:
- _id: MiLe
doi: 10.1142/S0217979218400222
external_id:
isi:
- '000438217300007'
intvolume: ' 32'
isi: 1
issue: '17'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1710.11171
month: '07'
oa: 1
oa_version: Preprint
page: '1840022'
publication: International Journal of Modern Physics B
publication_status: published
publisher: World Scientific Publishing
publist_id: '7402'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Renormalization of the superfluid density in the two-dimensional BCS-BEC crossover
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 32
year: '2018'
...
---
_id: '6339'
abstract:
- lang: eng
text: We introduce a diagrammatic Monte Carlo approach to angular momentum properties
of quantum many-particle systems possessing a macroscopic number of degrees of
freedom. The treatment is based on a diagrammatic expansion that merges the usual
Feynman diagrams with the angular momentum diagrams known from atomic and nuclear
structure theory, thereby incorporating the non-Abelian algebra inherent to quantum
rotations. Our approach is applicable at arbitrary coupling, is free of systematic
errors and of finite-size effects, and naturally provides access to the impurity
Green function. We exemplify the technique by obtaining an all-coupling solution
of the angulon model; however, the method is quite general and can be applied
to a broad variety of systems in which particles exchange quantum angular momentum
with their many-body environment.
article_number: '165301'
article_processing_charge: No
author:
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: Timur
full_name: Tscherbul, Timur
last_name: Tscherbul
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
citation:
ama: Bighin G, Tscherbul T, Lemeshko M. Diagrammatic Monte Carlo approach to angular
momentum in quantum many-particle systems. Physical Review Letters. 2018;121(16).
doi:10.1103/physrevlett.121.165301
apa: Bighin, G., Tscherbul, T., & Lemeshko, M. (2018). Diagrammatic Monte Carlo
approach to angular momentum in quantum many-particle systems. Physical Review
Letters. American Physical Society. https://doi.org/10.1103/physrevlett.121.165301
chicago: Bighin, Giacomo, Timur Tscherbul, and Mikhail Lemeshko. “Diagrammatic Monte Carlo
Approach to Angular Momentum in Quantum Many-Particle Systems.” Physical Review
Letters. American Physical Society, 2018. https://doi.org/10.1103/physrevlett.121.165301.
ieee: G. Bighin, T. Tscherbul, and M. Lemeshko, “Diagrammatic Monte Carlo approach
to angular momentum in quantum many-particle systems,” Physical Review Letters,
vol. 121, no. 16. American Physical Society, 2018.
ista: Bighin G, Tscherbul T, Lemeshko M. 2018. Diagrammatic Monte Carlo approach
to angular momentum in quantum many-particle systems. Physical Review Letters.
121(16), 165301.
mla: Bighin, Giacomo, et al. “Diagrammatic Monte Carlo Approach to Angular Momentum
in Quantum Many-Particle Systems.” Physical Review Letters, vol. 121, no.
16, 165301, American Physical Society, 2018, doi:10.1103/physrevlett.121.165301.
short: G. Bighin, T. Tscherbul, M. Lemeshko, Physical Review Letters 121 (2018).
date_created: 2019-04-17T10:53:38Z
date_published: 2018-10-16T00:00:00Z
date_updated: 2024-02-28T13:15:09Z
day: '16'
department:
- _id: MiLe
doi: 10.1103/physrevlett.121.165301
external_id:
arxiv:
- '1803.07990'
isi:
- '000447468400008'
intvolume: ' 121'
isi: 1
issue: '16'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1803.07990
month: '10'
oa: 1
oa_version: Preprint
project:
- _id: 26031614-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P29902
name: Quantum rotations in the presence of a many-body environment
publication: Physical Review Letters
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
related_material:
link:
- description: News on IST Homepage
relation: press_release
url: https://ist.ac.at/en/news/description-of-rotating-molecules-made-easy/
scopus_import: '1'
status: public
title: Diagrammatic Monte Carlo approach to angular momentum in quantum many-particle
systems
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 121
year: '2018'
...
---
_id: '417'
abstract:
- lang: eng
text: 'We introduce a Diagrammatic Monte Carlo (DiagMC) approach to complex molecular
impurities with rotational degrees of freedom interacting with a many-particle
environment. The treatment is based on the diagrammatic expansion that merges
the usual Feynman diagrams with the angular momentum diagrams known from atomic
and nuclear structure theory, thereby incorporating the non-Abelian algebra inherent
to quantum rotations. Our approach works at arbitrary coupling, is free of systematic
errors and of finite size effects, and naturally provides access to the impurity
Green function. We exemplify the technique by obtaining an all-coupling solution
of the angulon model, however, the method is quite general and can be applied
to a broad variety of quantum impurities possessing angular momentum degrees of
freedom. '
article_number: '165301'
article_processing_charge: No
author:
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: Timur
full_name: Tscherbul, Timur
last_name: Tscherbul
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
citation:
ama: Bighin G, Tscherbul T, Lemeshko M. Diagrammatic Monte Carlo approach to rotating
molecular impurities. Physical Review Letters. 2018;121(16). doi:10.1103/PhysRevLett.121.165301
apa: Bighin, G., Tscherbul, T., & Lemeshko, M. (2018). Diagrammatic Monte Carlo
approach to rotating molecular impurities. Physical Review Letters. American
Physical Society. https://doi.org/10.1103/PhysRevLett.121.165301
chicago: Bighin, Giacomo, Timur Tscherbul, and Mikhail Lemeshko. “Diagrammatic Monte
Carlo Approach to Rotating Molecular Impurities.” Physical Review Letters.
American Physical Society, 2018. https://doi.org/10.1103/PhysRevLett.121.165301.
ieee: G. Bighin, T. Tscherbul, and M. Lemeshko, “Diagrammatic Monte Carlo approach
to rotating molecular impurities,” Physical Review Letters, vol. 121, no.
16. American Physical Society, 2018.
ista: Bighin G, Tscherbul T, Lemeshko M. 2018. Diagrammatic Monte Carlo approach
to rotating molecular impurities. Physical Review Letters. 121(16), 165301.
mla: Bighin, Giacomo, et al. “Diagrammatic Monte Carlo Approach to Rotating Molecular
Impurities.” Physical Review Letters, vol. 121, no. 16, 165301, American
Physical Society, 2018, doi:10.1103/PhysRevLett.121.165301.
short: G. Bighin, T. Tscherbul, M. Lemeshko, Physical Review Letters 121 (2018).
date_created: 2018-12-11T11:46:22Z
date_published: 2018-10-16T00:00:00Z
date_updated: 2024-02-28T13:14:53Z
day: '16'
department:
- _id: MiLe
doi: 10.1103/PhysRevLett.121.165301
external_id:
arxiv:
- '1803.07990'
intvolume: ' 121'
issue: '16'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1803.07990
month: '10'
oa: 1
oa_version: Preprint
project:
- _id: 26031614-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P29902
name: Quantum rotations in the presence of a many-body environment
publication: Physical Review Letters
publication_status: published
publisher: American Physical Society
publist_id: '8025'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Diagrammatic Monte Carlo approach to rotating molecular impurities
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 121
year: '2018'
...
---
_id: '1015'
abstract:
- lang: eng
text: 'Vortices are commonly observed in the context of classical hydrodynamics:
from whirlpools after stirring the coffee in a cup to a violent atmospheric phenomenon
such as a tornado, all classical vortices are characterized by an arbitrary circulation
value of the local velocity field. On the other hand the appearance of vortices
with quantized circulation represents one of the fundamental signatures of macroscopic
quantum phenomena. In two-dimensional superfluids quantized vortices play a key
role in determining finite-temperature properties, as the superfluid phase and
the normal state are separated by a vortex unbinding transition, the Berezinskii-Kosterlitz-Thouless
transition. Very recent experiments with two-dimensional superfluid fermions motivate
the present work: we present theoretical results based on the renormalization
group showing that the universal jump of the superfluid density and the critical
temperature crucially depend on the interaction strength, providing a strong benchmark
for forthcoming investigations.'
article_number: '45702'
article_processing_charge: No
author:
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: Luca
full_name: Salasnich, Luca
last_name: Salasnich
citation:
ama: Bighin G, Salasnich L. Vortices and antivortices in two-dimensional ultracold
Fermi gases. Scientific Reports. 2017;7. doi:10.1038/srep45702
apa: Bighin, G., & Salasnich, L. (2017). Vortices and antivortices in two-dimensional
ultracold Fermi gases. Scientific Reports. Nature Publishing Group. https://doi.org/10.1038/srep45702
chicago: Bighin, Giacomo, and Luca Salasnich. “Vortices and Antivortices in Two-Dimensional
Ultracold Fermi Gases.” Scientific Reports. Nature Publishing Group, 2017.
https://doi.org/10.1038/srep45702.
ieee: G. Bighin and L. Salasnich, “Vortices and antivortices in two-dimensional
ultracold Fermi gases,” Scientific Reports, vol. 7. Nature Publishing Group,
2017.
ista: Bighin G, Salasnich L. 2017. Vortices and antivortices in two-dimensional
ultracold Fermi gases. Scientific Reports. 7, 45702.
mla: Bighin, Giacomo, and Luca Salasnich. “Vortices and Antivortices in Two-Dimensional
Ultracold Fermi Gases.” Scientific Reports, vol. 7, 45702, Nature Publishing
Group, 2017, doi:10.1038/srep45702.
short: G. Bighin, L. Salasnich, Scientific Reports 7 (2017).
date_created: 2018-12-11T11:49:42Z
date_published: 2017-04-04T00:00:00Z
date_updated: 2023-09-22T09:43:10Z
day: '04'
ddc:
- '539'
department:
- _id: MiLe
doi: 10.1038/srep45702
external_id:
isi:
- '000398148100001'
file:
- access_level: open_access
content_type: application/pdf
creator: system
date_created: 2018-12-12T10:12:32Z
date_updated: 2018-12-12T10:12:32Z
file_id: '4950'
file_name: IST-2017-809-v1+1_srep45702.pdf
file_size: 478289
relation: main_file
file_date_updated: 2018-12-12T10:12:32Z
has_accepted_license: '1'
intvolume: ' 7'
isi: 1
language:
- iso: eng
month: '04'
oa: 1
oa_version: Published Version
publication: Scientific Reports
publication_identifier:
issn:
- '20452322'
publication_status: published
publisher: Nature Publishing Group
publist_id: '6380'
pubrep_id: '809'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Vortices and antivortices in two-dimensional ultracold Fermi gases
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: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 7
year: '2017'
...
---
_id: '995'
abstract:
- lang: eng
text: Recently it was shown that an impurity exchanging orbital angular momentum
with a surrounding bath can be described in terms of the angulon quasiparticle
[Phys. Rev. Lett. 118, 095301 (2017)]. The angulon consists of a quantum rotor
dressed by a many-particle field of boson excitations, and can be formed out of,
for example, a molecule or a nonspherical atom in superfluid helium, or out of
an electron coupled to lattice phonons or a Bose condensate. Here we develop an
approach to the angulon based on the path-integral formalism, which sets the ground
for a systematic, perturbative treatment of the angulon problem. The resulting
perturbation series can be interpreted in terms of Feynman diagrams, from which,
in turn, one can derive a set of diagrammatic rules. These rules extend the machinery
of the graphical theory of angular momentum - well known from theoretical atomic
spectroscopy - to the case where an environment with an infinite number of degrees
of freedom is present. In particular, we show that each diagram can be interpreted
as a 'skeleton', which enforces angular momentum conservation, dressed by an additional
many-body contribution. This connection between the angulon theory and the graphical
theory of angular momentum is particularly important as it allows to systematically
and substantially simplify the analytical representation of each diagram. In order
to exemplify the technique, we calculate the 1- and 2-loop contributions to the
angulon self-energy, the spectral function, and the quasiparticle weight. The
diagrammatic theory we develop paves the way to investigate next-to-leading order
quantities in a more compact way compared to the variational approaches.
article_number: '085410'
article_processing_charge: No
author:
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
citation:
ama: Bighin G, Lemeshko M. Diagrammatic approach to orbital quantum impurities interacting
with a many-particle environment. Physical Review B - Condensed Matter and
Materials Physics. 2017;96(8). doi:10.1103/PhysRevB.96.085410
apa: Bighin, G., & Lemeshko, M. (2017). Diagrammatic approach to orbital quantum
impurities interacting with a many-particle environment. Physical Review B
- Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.96.085410
chicago: Bighin, Giacomo, and Mikhail Lemeshko. “Diagrammatic Approach to Orbital
Quantum Impurities Interacting with a Many-Particle Environment.” Physical
Review B - Condensed Matter and Materials Physics. American Physical Society,
2017. https://doi.org/10.1103/PhysRevB.96.085410.
ieee: G. Bighin and M. Lemeshko, “Diagrammatic approach to orbital quantum impurities
interacting with a many-particle environment,” Physical Review B - Condensed
Matter and Materials Physics, vol. 96, no. 8. American Physical Society, 2017.
ista: Bighin G, Lemeshko M. 2017. Diagrammatic approach to orbital quantum impurities
interacting with a many-particle environment. Physical Review B - Condensed Matter
and Materials Physics. 96(8), 085410.
mla: Bighin, Giacomo, and Mikhail Lemeshko. “Diagrammatic Approach to Orbital Quantum
Impurities Interacting with a Many-Particle Environment.” Physical Review B
- Condensed Matter and Materials Physics, vol. 96, no. 8, 085410, American
Physical Society, 2017, doi:10.1103/PhysRevB.96.085410.
short: G. Bighin, M. Lemeshko, Physical Review B - Condensed Matter and Materials
Physics 96 (2017).
date_created: 2018-12-11T11:49:36Z
date_published: 2017-08-07T00:00:00Z
date_updated: 2023-09-22T09:53:17Z
day: '07'
department:
- _id: MiLe
doi: 10.1103/PhysRevB.96.085410
external_id:
isi:
- '000407017100009'
intvolume: ' 96'
isi: 1
issue: '8'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1704.02616
month: '08'
oa: 1
oa_version: Submitted Version
project:
- _id: 26031614-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P29902
name: Quantum rotations in the presence of a many-body environment
publication: Physical Review B - Condensed Matter and Materials Physics
publication_identifier:
issn:
- '24699950'
publication_status: published
publisher: American Physical Society
publist_id: '6404'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Diagrammatic approach to orbital quantum impurities interacting with a many-particle
environment
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 96
year: '2017'
...