| Issue |
Europhys. Lett.
Volume 67, Number 6, September 2004
|
|
|---|---|---|
| Page(s) | 887 - 892 | |
| Section | General | |
| DOI | https://doi.org/10.1209/epl/i2004-10140-7 | |
| Published online | 01 September 2004 | |
Bogoliubov speed of sound for a dilute Bose-Einstein condensate in a 3d optical lattice
Institut für Physik, Carl von Ossietzky Universität - D-26111 Oldenburg, Germany
Received:
12
May
2004
Accepted:
8
July
2004
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.
PACS: 03.75.Lm – Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices and topological excitations / 03.75.Kk – Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow / 05.30.Jp – Boson systems
© EDP Sciences, 2004
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