Single-particle excitations and strong coupling effects in the bcs–bec crossover regime of a rare-earth fermi gas with an orbital feshbach resonance

Soumita Mondal, Daisuke Inotani, Yoji Ohashi

研究成果: Article査読

11 被引用数 (Scopus)

抄録

We theoretically investigate normal-state properties of an ultracold Fermi gas with an orbital Feshbach resonance (OFR). Recently, OFR has attracted much attention as a promising pairing mechanism to realize a superfluid173Yb Fermi gas. Including pairing fluctuations within a T-matrix approximation, and removing effects of an experimentally inaccessible deep bound state, we evaluate strong-coupling corrections to single-particle excitations. With increasing the strength of an OFR-induced tunable pairing interaction, the open channel is shown to exhibit the pseudogap phenomenon in the BCS–BEC crossover region, as in the case of a broad magnetic Feshbach resonance (MFR) in6Li and40K Fermi gases. We also show that the strong pairing interaction affects the closed channel, leading to the coexistence of particle and hole branches in the single-particle spectral weight. Since the latter phenomenon cannot be observed in the conventional MFR case, it may be viewed as a characteristic strong-coupling phenomenon peculiar to the OFR case.

本文言語English
論文番号084302
ジャーナルJournal of the Physical Society of Japan
87
8
DOI
出版ステータスPublished - 2018

ASJC Scopus subject areas

  • 物理学および天文学一般

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