Thursday, July 11, 2013

1307.2655 (R. Mendoza et al.)

Collective excitations of an imbalanced fermion gas in a 1D optical

R. Mendoza, Mauricio Fortes, M. A. Solís
The collective excitations that minimize the Helmholtz free energy of a population-imbalanced mixture of a $^{6}$Li gas loaded in a quasi one-dimensional optical lattice are obtained. These excitations reveal a rotonic branch after solving the Bethe-Salpeter equation under a generalized random phase approximation based on a single-band Hubbard Hamiltonian. The phase diagram describing stability regions of Fulde-Farrell-Larkin-Ovchinnikov and Sarma phases is also analyzed.
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