Photoemission spectrum in the BCS-BEC crossover regime of a rare-earth fermi gas with an orbital feshbach resonance

Soumita Mondal, Daisuke Inotani, Yoji Ohashi

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Abstract

We theoretically investigate photoemission spectrum (PES) in a 173Yb Fermi gas with a tunable pairing interaction associated with an orbital Feshbach resonance. Including the two-channel character of this rare-earth atomic system, we examine strong-coupling effects on single-particle properties of the open and closed channels, within the framework of an T-matrix approximation in terms of fluctuations in the Cooper channel. In the BCS-BEC crossover region, PES in the closed channel is shown to exhibit non-vanishing intensity in the negative energy region, as an effect of pairing fluctuations. On the other hand, PES in the open channel exhibits a pseudogap phenomenon, as in the case of a broad magnetic Feshbach resonance discussed in 40K and 6Li Fermi gases. We also examine effects of a harmonic trap in the local density approximation, to see how the spatial inhomogeneity affects strong-coupling corrections to PES.

Original languageEnglish
Article number094301
JournalJournal of the Physical Society of Japan
Volume87
Issue number9
DOIs
Publication statusPublished - 2018 Jan 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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