Finite temperature effects in trapped Fermi gases with population imbalance

Details Finite temperature effects in trapped Fermi gases with population imbalance Finite temperature effects in trapped Fermi gases with population imbalance

2006-05-28

arxiv.org/abs/cond-mat/0605684v1

Phys. Rev. A 74, 021602(R) 2006

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevA.74.021602

We study the finite temperature $T$ behavior of trapped Fermi gases as they undergo BCS-Bose Einstein condensation (BEC) crossover, in the presence of a population imbalance. Our results, in qualitative agreement with recent experiments, show how the superfluid phase transition is directly reflected in the particle density profiles. We demonstrate that at $ T \neq 0$ and in the near-BEC and unitary regimes, the polarization is excluded from the superfluid core. Nevertheless a substantial polarization fraction is carried by a normal region of the trap having strong pair correlations, which we associate with noncondensed pairs or the ``pseudogap phase''.

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