Coherent cross-talk and parametric driving of matter-wave vortices
Abstract
We show that the interaction between vortices and sound waves in atomic Bose-Einstein condensates can be elucidated in a double-well trap: with one vortex in each well, the sound emitted by each precessing vortex can be driven into the opposing vortex (if of the same polarity). This cross-talk leads to a periodic exchange of energy between the vortices which is long-range and highly efficient. The increase in vortex energy (obtained by numerical simulations of the Gross-Pitaevskii equation) is significant and experimentally observable as a migration of the vortex to higher density over just a few precession periods. Similar effects can be controllably engineered by introducing a precessing localised obstacle into one well as an artificial generator of sound, thereby demonstrating the parametric driving of energy into a vortex.
Keywords
Cite
@article{arxiv.1109.0039,
title = {Coherent cross-talk and parametric driving of matter-wave vortices},
author = {N. G. Parker and A. J. Allen and C. F. Barenghi and N. P. Proukakis},
journal= {arXiv preprint arXiv:1109.0039},
year = {2012}
}
Comments
12 pages, 13 figures