Landau and Dynamical Instabilities of the Superflow of Bose-Einstein Condensates in Optical Lattices

Details Landau and Dynamical Instabilities of the Superflow of Bose-Einstein Condensates in Optical Lattices Landau and Dynamical Instabilities of the Superflow of Bose-Einstein Condensates in Optical Lattices

2000-09-28

arxiv.org/abs/cond-mat/0009455v3

Phys. Rev. A, 64 (2001) 061603(R)

Physics

Condensed Matter

RevTex, 4 pages, 2 figures

Scientific paper

10.1103/PhysRevA.64.061603

The superfluidity of Bose-Einstein condensates in optical lattices are investigated. Apart from the usual Landau instability which occurs when a BEC flows faster than the speed of sound, the BEC can also suffer a dynamical instability, resulting in period doubling and other sorts of symmetry breaking of the system. Such an instability may play a crucial role in the dissipative motion of a trapped BEC in an optical lattice recently observed [1].

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