Zero-Temperature Properties of a Strongly Interacting Superfluid Fermi Gas in the BCS–BEC Crossover Region

H. Tajima, P. van Wyk, R. Hanai, D. Kagamihara, Daisuke Inotani, M. Horikoshi, Yoji Ohashi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We investigate thermodynamic properties and effects of quantum fluctuations in the Bardeen–Cooper–Schrieffer (BCS)–Bose–Einstein condensation (BEC) crossover region of a superfluid Fermi gas in the low-temperature limit. Including strong-coupling corrections within the framework of an extended T-matrix approximation, we numerically compute the isothermal compressibility (Formula presented.). While quantum fluctuation effects on (Formula presented.) in the strong-coupling BEC regime are explained by the quantum depletion due to a repulsive interaction between tightly bound molecules, effects of self-energy shift on the Fermi chemical potential are found to enhance (Formula presented.) in the weak-coupling BCS region. We also show that the calculated (Formula presented.) agrees well with the recent experiment on a (Formula presented.)Li Fermi gas done from the weak-coupling region to the unitarity limit. Our result would be useful for the study of many-body quantum corrections in the BCS–BEC crossover region of a strongly interacting Fermi superfluid.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalJournal of Low Temperature Physics
DOIs
Publication statusAccepted/In press - 2016 Nov 3

Fingerprint

Condensation
crossovers
Gases
Chemical potential
Compressibility
gases
Thermodynamic properties
Temperature
condensation
Molecules
temperature
Experiments
compressibility
depletion
thermodynamic properties
shift
approximation
molecules
interactions
energy

Keywords

  • BCS–BEC crossover
  • Quantum fluctuations
  • Ultracold Fermi gas

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Zero-Temperature Properties of a Strongly Interacting Superfluid Fermi Gas in the BCS–BEC Crossover Region. / Tajima, H.; van Wyk, P.; Hanai, R.; Kagamihara, D.; Inotani, Daisuke; Horikoshi, M.; Ohashi, Yoji.

In: Journal of Low Temperature Physics, 03.11.2016, p. 1-8.

Research output: Contribution to journalArticle

Tajima, H. ; van Wyk, P. ; Hanai, R. ; Kagamihara, D. ; Inotani, Daisuke ; Horikoshi, M. ; Ohashi, Yoji. / Zero-Temperature Properties of a Strongly Interacting Superfluid Fermi Gas in the BCS–BEC Crossover Region. In: Journal of Low Temperature Physics. 2016 ; pp. 1-8.
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AU - Inotani, Daisuke

AU - Horikoshi, M.

AU - Ohashi, Yoji

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