Abstract
We have modulated the density of a trapped Bose-Einstein condensate by changing the trap stiffness, thereby modulating the speed of sound. 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.
- Received 5 July 2012
DOI:https://doi.org/10.1103/PhysRevLett.109.220401
© 2012 American Physical Society
Viewpoint
Modeling Quantum Field Theory
Published 26 November 2012
An analog of the dynamical Casimir effect has been achieved, where phonons replace photons and thermal fluctuations replace vacuum fluctuations.
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