Phys. Rev. A 64, 061603(R) (2001) [4 pages]Landau and dynamical instabilities of the superflow of Bose-Einstein condensates in optical lattices
The superfluidity of Bose-Einstein condensates (BECs) in optical lattices is 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 plays a crucial role in the dissipative motion of a trapped BEC in an optical lattice recently observed [Burger et al., Phys. Rev. Lett. 86, 4447 (2001)]. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.64.061603
DOI:
10.1103/PhysRevA.64.061603
PACS:
03.75.Fi, 05.30.Jp, 32.80.Pj, 67.40.Db
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