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

Biao Wu; Qian Niu

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

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arxiv cond-mat/0009455 v3 pith:N36Z7T2S submitted 2000-09-28 cond-mat

Biao Wu , Qian Niu This is my paper · ORCID

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keywords instabilityopticalbose-einsteincondensatesdynamicallandaulatticesapart

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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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Dissipation triggers dynamical two-stream instability
gr-qc 2019-08 conditional novelty 7.0 of 10

Dissipation makes the relativistic two-stream instability dynamical exactly at the counterflow velocity where an ideal fluid would only show an energetic instability.

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