Bogoliubov speed of sound for a dilute Bose-Einstein condensate in a 3d optical lattice

Boers, D.; Weiss, C.; Holthaus, M.

doi:10.1209/epl/i2004-10140-7

Bogoliubov speed of sound for a dilute Bose-Einstein condensate in a 3d optical lattice

Boers, D.; Weiss, C.; Holthaus, M.

Authors

D. Boers

C. Weiss

M. Holthaus

Abstract

We point out that the velocity of propagation of sound wavepackets in a Bose-Einstein condensate filling a three-dimensional cubic optical lattice undergoes a maximum with increasing lattice depth. For a realistic choice of parameters, the maximum sound velocity in a lattice condensate can exceed the sound velocity in a homogeneous condensate with the same average density by 30%. The maximum falls into the superfluid regime, and should be observable under currently achievable laboratory conditions.

Citation

Boers, D., Weiss, C., & Holthaus, M. (2004). Bogoliubov speed of sound for a dilute Bose-Einstein condensate in a 3d optical lattice. European Physical Society Letters, 67(6), https://doi.org/10.1209/epl/i2004-10140-7

Journal Article Type	Article
Acceptance Date	Jul 8, 2004
Publication Date	Sep 1, 2004
Deposit Date	Jul 29, 2014
Publicly Available Date	Mar 18, 2015
Journal	Europhysics Letters
Print ISSN	0295-5075
Electronic ISSN	1286-4854
Publisher	IOP Publishing
Peer Reviewed	Peer Reviewed
Volume	67
Issue	6
DOI	https://doi.org/10.1209/epl/i2004-10140-7