Two-dimensional pseudogap effects of an ultracold Fermi gas in the BCS-BEC crossover region

Abstract

We investigate pseudogap phenomena originating from pairing fluctuations in the BCS-BEC crossover regime of a two-dimensional Fermi gas in a harmonic trap. Including pairing fluctuations within a $T$-matrix theory and effects of a trap within the local density approximation, we calculate the local density of states (LDOS) at the superfluid phase transition temperature $T_{\mathrm{c}}$. In the weak-coupling regime, we show that the pseudogap already appears in LDOS around the trap center. The spatial region where the pseudogap can be seen in LDOS becomes wider for a strong pairing interaction. We also discuss how the pseudogap affects the spectrum of the photoemission-type experiment developed by JILA group.

7 pages, 4 figures, proceedings of QFS 2012

References in corpus (6)

• Many-Body Physics with Ultracold Gases
• Theory of ultracold Fermi gases
• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• Observation of pseudogap behavior in a strongly interacting Fermi gas
• Observation of a pairing pseudogap in a two-dimensional Fermi gas
• Evolution of Fermion Pairing from Three to Two Dimensions

Cited by in corpus (1)

• Precision thermodynamics of the strongly interacting Fermi gas in two dimensions