2012/07/31 by Jean-Christophe Jaskula, Guthrie B. Partridge, Marie Bonneau +4 · 2 citations
Physics and Astronomy · #cond-mat.quant-gas
paper · pdf · doi:10.1103/physrevlett.109.220401
published as Physical Review Letters 109 (2012) 220401 · Includes supplemental information
arxiv created 2012/11/29 · arxiv updated 2012/11/30
We have realized an acoustic analog to the Dynamical Casimir effect. The density of a trapped Bose-Einstein condensate is modulated by changing the trap stiffness. We observe the creation of correlated excitations with equal and opposite momenta, and show that for a well defined modulation frequency, the frequency of the excitations is half that of the trap modulation frequency.