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Coherent cross talk and parametric driving of matter-wave vortices

Lookup NU author(s): Dr Nicholas Parker, Dr Joy Allen, Professor Carlo Barenghi, Professor Nikolaos Proukakis

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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 simulations of the Gross-Pitaevskii equation) is 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 localized obstacle into one well as an artificial generator of sound, thereby demonstrating the parametric driving of energy into a vortex.


Publication metadata

Author(s): Parker NG, Allen AJ, Barenghi CF, Proukakis NP

Publication type: Article

Journal: Physical Review A

Year: 2012

Volume: 86

Issue: 1

Print publication date: 20/07/2012

ISSN (print): 1050-2947

ISSN (electronic): 1094-1622

Publisher: American Physical Society

URL: http://dx.doi.org/10.1103/PhysRevA.86.013631

DOI: 10.1103/PhysRevA.86.013631


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