Hydrodynamics of Superfluid Bose Gases in an Optical Lattice at Finite Temperatures

Details Hydrodynamics of Superfluid Bose Gases in an Optical Lattice at Finite Temperatures Hydrodynamics of Superfluid Bose Gases in an Optical Lattice at Finite Temperatures

2006-07-13

arxiv.org/abs/cond-mat/0607320v1

Journal of Low Temperature Physics 148, 453 (2007)

Physics

Condensed Matter

Other Condensed Matter

6pages, submitted to Quantum Fluids and Solids Conference (QFS 2006)

Scientific paper

10.1007/s10909-007-9407-9

Starting from an effective action for the order parameter field, we derive a coupled set of generalized hydrodynamic equations for a Bose condensate in an optical lattice at finite temperatures. Using the linearized hydrodynamic equations, we study the microscopic mechanism of the Landau instability due to the collisional damping process between condensate and noncondensate atoms. It is shown that the Landau criterion of the superfluidity for the uniform system is modified due to the presence of the periodic optical lattice potential.

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