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

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

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
• Public URL: https://durham-repository.worktribe.com/output/1425485