1207.1163 (Ryota Watanabe et al.)

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

Ryota Watanabe, Shunji Tsuchiya, Yoji Ohashi

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 $T_{\rm c}$. 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.

View original: http://arxiv.org/abs/1207.1163