Volume 67, Number 6, September 2004
|Page(s)||887 - 892|
|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
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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