Single-particle spectral density of the unitary Fermi gas: Novel approach based on the operator product expansion, sum rules and the maximum entropy method

Philipp Gubler, Naoki Yamamoto, Tetsuo Hatsuda, Yusuke Nishida

研究成果: Article査読

9 被引用数 (Scopus)

抄録

Making use of the operator product expansion, we derive a general class of sum rules for the imaginary part of the single-particle self-energy of the unitary Fermi gas. The sum rules are analyzed numerically with the help of the maximum entropy method, which allows us to extract the single-particle spectral density as a function of both energy and momentum. These spectral densities contain basic information on the properties of the unitary Fermi gas, such as the dispersion relation and the superfluid pairing gap, for which we obtain reasonable agreement with the available results based on quantum Monte-Carlo simulations.

本文言語English
ページ(範囲)467-497
ページ数31
ジャーナルAnnals of Physics
356
DOI
出版ステータスPublished - 2015 5 1

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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