2004/07/23 by Dave Boers, D Boers, Christoph Weiss +3
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Quantum Electrodynamics and Casimir Effect #Strong Light-Matter Interactions #cond-mat.soft
paper · pdf · doi:10.1209/epl/i2004-10140-7
published as Europhys. Lett. 67, 887 (2004) · 6 pages, 2 figures, accepted for publication in Europhys. Lett. http://www.epletters.ch/
arxiv created 2004/07/23 · openalex publication_date 2004/09/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
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.