Coupling vortex dynamics with collective excitations in Bose-Einstein Condensates
Quantum Gases
2014-02-11 v1
Abstract
Here we analyze the collective excitations as well as the expansion of a trapped Bose-Einstein condensate with a vortex line at its center. To this end, we propose a variational method where the variational parameters have to be carefully chosen in order to produce reliable results. Our variational calculations agree with numerical simulations of the Gross-Pitaevskii equation. The system considered here turns out to exhibit four collective modes of which only three can be observed at a time depending of the trap anisotropy. We also demonstrate that these collective modes can be excited using well established experimental methods such as modulation of the s-wave scattering length.
Cite
@article{arxiv.1306.2534,
title = {Coupling vortex dynamics with collective excitations in Bose-Einstein Condensates},
author = {R. P. Teles and V. S. Bagnato and F. E. A. dos Santos},
journal= {arXiv preprint arXiv:1306.2534},
year = {2014}
}