Detecting phonons and persistent currents in toroidal Bose-Einstein condensates by means of pattern formation
Other Condensed Matter
2009-11-11 v2
Abstract
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.
Keywords
Cite
@article{arxiv.cond-mat/0605183,
title = {Detecting phonons and persistent currents in toroidal Bose-Einstein condensates by means of pattern formation},
author = {M. Modugno and C. Tozzo and F. Dalfovo},
journal= {arXiv preprint arXiv:cond-mat/0605183},
year = {2009}
}
Comments
4 pages, 4 figures; new figures, revised version to appear as a Rapid Communication in Physical Review A