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

Preprint

7 April 2001

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0009455

Abstract

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].

Keywords

DYNAMICAL INSTABILITIES
EINSTEIN CONDENSATES
SPEED OF SOUND
BOSE EINSTEIN
INSTABILITY
SUPERFLOW
LANDAU
BEC

All Related Versions

Version 1, 2000-09-29, ArXiv
Version 2, 2000-10-01, ArXiv
Version 3, 2001-04-07, ArXiv
Published version: Physical Review A, 64 (6), 061603.

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