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

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20 Citations (Scopus)

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

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    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