Landau and dynamical instabilities of the superflow of Bose-Einstein condensates in optical lattices
- 15 November 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 64 (6), 061603
- https://doi.org/10.1103/physreva.64.061603
Abstract
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)].Keywords
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