Evolution of the Pseudogap in a polarized Fermi gas

Details Evolution of the Pseudogap in a polarized Fermi gas Evolution of the Pseudogap in a polarized Fermi gas

2010-12-03

arxiv.org/abs/1012.0820v1

Physics

Condensed Matter

Quantum Gases

7 pages, 6 figures

Scientific paper

We calculate the single particle spectral density of a normal (non-superfluid) two component gas of fermions in the BCS-BEC crossover within a T-matrix approximation. We review how non-condensed pairs lead to a spectral density reminiscent of the ordered state, and explore how a gap-like feature in the spectrum evolves as one changes the polarization of the gas. As the gas is polarized we find that this pseudogap becomes more diffuse and moves away from the Fermi level, reflecting the fact that fewer pairs are present but that they still play an important role in the excitations.

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