Strong-coupling corrections to ground-state properties of a superfluid Fermi gas

Hiroyuki Tajima, Pieter Van Wyk, Ryo Hanai, Daichi Kagamihara, Daisuke Inotani, Munekazu Horikoshi, Yoji Ohashi

Research output: Contribution to journalArticle

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Abstract

We theoretically present an economical and convenient way to study ground-state properties of a strongly interacting superfluid Fermi gas. Our strategy is that complicated strong-coupling calculations are used only to evaluate quantum fluctuation corrections to the chemical potential μ. Then, without any further strong-coupling calculations, we calculate the compressibility, sound velocity, internal energy, pressure, and Tan's contact, from the calculated μ without loss of accuracy, by using exact thermodynamic identities. Using a recent precise measurement of μ in a superfluid Li6 Fermi gas, we show that an extended T-matrix approximation (ETMA) is suitable for our purpose, especially in the BCS-unitary regime, where our results indicate that many-body corrections are dominated by superfluid fluctuations. Since precise determinations of physical quantities are not always easy in cold Fermi gas physics, our approach would greatly reduce experimental and theoretical efforts toward the understanding of ground-state properties of this strongly interacting Fermi system.

Original languageEnglish
Article number043625
JournalPhysical Review A
Volume95
Issue number4
DOIs
Publication statusPublished - 2017 Apr 19

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ground state
gases
internal energy
acoustic velocity
compressibility
thermodynamics
physics
approximation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Tajima, H., Van Wyk, P., Hanai, R., Kagamihara, D., Inotani, D., Horikoshi, M., & Ohashi, Y. (2017). Strong-coupling corrections to ground-state properties of a superfluid Fermi gas. Physical Review A, 95(4), [043625]. https://doi.org/10.1103/PhysRevA.95.043625

Strong-coupling corrections to ground-state properties of a superfluid Fermi gas. / Tajima, Hiroyuki; Van Wyk, Pieter; Hanai, Ryo; Kagamihara, Daichi; Inotani, Daisuke; Horikoshi, Munekazu; Ohashi, Yoji.

In: Physical Review A, Vol. 95, No. 4, 043625, 19.04.2017.

Research output: Contribution to journalArticle

Tajima, H, Van Wyk, P, Hanai, R, Kagamihara, D, Inotani, D, Horikoshi, M & Ohashi, Y 2017, 'Strong-coupling corrections to ground-state properties of a superfluid Fermi gas', Physical Review A, vol. 95, no. 4, 043625. https://doi.org/10.1103/PhysRevA.95.043625
Tajima H, Van Wyk P, Hanai R, Kagamihara D, Inotani D, Horikoshi M et al. Strong-coupling corrections to ground-state properties of a superfluid Fermi gas. Physical Review A. 2017 Apr 19;95(4). 043625. https://doi.org/10.1103/PhysRevA.95.043625
Tajima, Hiroyuki ; Van Wyk, Pieter ; Hanai, Ryo ; Kagamihara, Daichi ; Inotani, Daisuke ; Horikoshi, Munekazu ; Ohashi, Yoji. / Strong-coupling corrections to ground-state properties of a superfluid Fermi gas. In: Physical Review A. 2017 ; Vol. 95, No. 4.
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