Instability of a superfluid Bose gas induced by a locked thermal gas in an optical lattice
arXiv:cond-mat/0512007 · doi:10.1088/0953-4075/39/10/S10
Abstract
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.
arXiv comment10 pages, 1 figure
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- Critical velocity of flowing supersolids of dipolar Bose gases in optical lattices
- Heavily Damped Motion of One-Dimensional Bose Gases in an Optical Lattice
- Matter-wave dark solitons in a double-well potential
- Classical field model for arrays of photon condensates
- Detecting the superfluid critical momentum of Bose gases in optical lattices through dipole oscillations
- Instability of Holographic Superfuids in Optical Lattice
- Coarse-Grained Finite-Temperature Theory for the Condensate in Optical Lattices
- Hydrodynamics of Superfluid Bose Gases in an Optical Lattice at Finite Temperatures
- Landau and dynamical instabilities of Bose-Einstein condensates with superfluid flow in a Kronig-Penney potential
- Stability of current-carrying states in hard-core bosons with long-range hopping on a square lattice