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We investigate strong-coupling corrections to single-particle excitations inthe normal state of a spin-polarized unitary Fermi gas. Within the framework ofan extended T-matrix approximation, we calculate the single-particle density ofstates, as well as the single-particle spectral weight, to show that theso-called pseudogap phenomenon gradually disappears with increasing themagnitude of an effective magnetic field. In the highly spin-polarized regime,the calculated spin-polarization rate as a function of the effective magneticfield agrees well with the recent experiment on a 6Li Fermi gas. Although thisexperiment has been considered to be incompatible with the existence of thepseudogap in an unpolarized Fermi gas, our result clarifies that the observedspin-polarization rate in the highly spin-polarized regime and the pseudogap inthe unpolarized limit can be explained in a consistent manner, when onecorrectly includes effects of population imbalance on single-particleexcitations. Since it is a crucial issue to clarify whether the pseudogapexists or not in the BCS (Bardeen-Cooper-Schrieffer)-BEC (Bose-Einsteincondensation) crossover regime of an ultracold Fermi gas, our results would beuseful for the understanding of this strongly interacting fermion system.

Pseudogap phenomenon and effects of population imbalance in the normal state of a unitary Fermi gas