---
_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
arxiv: 1
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. <i>Physical
    Review A</i>. 2022;105(6). doi:<a href="https://doi.org/10.1103/PhysRevA.105.063329">10.1103/PhysRevA.105.063329</a>'
  apa: 'Bighin, G., Cappellaro, A., &#38; Salasnich, L. (2022). Unitary Fermi superfluid
    near the critical temperature: Thermodynamics and sound modes from elementary
    excitations. <i>Physical Review A</i>. American Physical Society. <a href="https://doi.org/10.1103/PhysRevA.105.063329">https://doi.org/10.1103/PhysRevA.105.063329</a>'
  chicago: 'Bighin, Giacomo, Alberto Cappellaro, and L. Salasnich. “Unitary Fermi
    Superfluid near the Critical Temperature: Thermodynamics and Sound Modes from
    Elementary Excitations.” <i>Physical Review A</i>. American Physical Society,
    2022. <a href="https://doi.org/10.1103/PhysRevA.105.063329">https://doi.org/10.1103/PhysRevA.105.063329</a>.'
  ieee: 'G. Bighin, A. Cappellaro, and L. Salasnich, “Unitary Fermi superfluid near
    the critical temperature: Thermodynamics and sound modes from elementary excitations,”
    <i>Physical Review A</i>, 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.” <i>Physical Review
    A</i>, vol. 105, no. 6, 063329, American Physical Society, 2022, doi:<a href="https://doi.org/10.1103/PhysRevA.105.063329">10.1103/PhysRevA.105.063329</a>.'
  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'
...