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Instability of a superfluid Bose gas induced by a locked thermal gas in an optical lattice
2006
Journal of Physics B: Atomic, Molecular and Optical Physics
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We use a dissipative Gross-Petaevskii equation derived from the Bose-Hubbard Hamiltonian to study the effect of the thermal component on the stability of a current-carrying superfluid state of a Bose gas in an optical lattice potential. We explicitly show that the superfluid state becomes unstable at certain quasi-momentum of the condensate due to a thermal component which is locked by an optical lattice potential. It is shown that this instability coincides with the Landau instability derived from the GP equation.
doi:10.1088/0953-4075/39/10/s10
fatcat:46npclaz6veczoclsesnd3iiry