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

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

2004-07-23

arxiv.org/abs/cond-mat/0407617v1

Europhys. Lett. 67, 887 (2004)

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 2 figures, accepted for publication in Europhys. Lett. http://www.epletters.ch/

Scientific paper

10.1209/epl/i2004-10140-7

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.

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