Detecting phonons and persistent currents in toroidal Bose-Einstein condensates by means of pattern formation

Details Detecting phonons and persistent currents in toroidal Bose-Einstein condensates by means of pattern formation Detecting phonons and persistent currents in toroidal Bose-Einstein condensates by means of pattern formation

2006-05-08

arxiv.org/abs/cond-mat/0605183v2

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures; new figures, revised version to appear as a Rapid Communication in Physical Review A

Scientific paper

10.1103/PhysRevA.74.061601

We theoretically investigate the dynamic properties of a Bose-Einstein condensate in a toroidal trap. A periodic modulation of the transverse confinement is shown to produce a density pattern due to parametric amplification of phonon pairs. By imaging the density distribution after free expansion one obtains i) a precise determination of the Bogoliubov spectrum and ii) a sensitive detection of quantized circulation in the torus. The parametric amplification is also sensitive to thermal and quantum fluctuations.

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