Landau and dynamical instabilities of the superflow of Bose-Einstein condensates in optical lattices

被引：353

作者：

Wu, B ^{[1
]}

Niu, Q ^{[1
]}

机构：

[1] Univ Texas, Dept Phys, Austin, TX 78712 USA

来源：

PHYSICAL REVIEW A | 2001年 / 64卷 / 06期

关键词：

D O I：

10.1103/PhysRevA.64.061603

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

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