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

Authors :
Mendoza, R.
Fortes, Mauricio
Solís, M. A.
Publication Year :
2013

Abstract

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.<br />Comment: Six pages and 3 figures

Subjects

Subjects :
Condensed Matter - Quantum Gases

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.1307.2655
Document Type :
Working Paper
Full Text :
https://doi.org/10.1007/s10909-013-0926-2