Coherent cross-talk and parametric driving of matter-wave vortices
arXiv:1109.0039 · doi:10.1103/PhysRevA.86.013631
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.
12 pages, 13 figures
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- Exploring Vortex Dynamics in the Presence of Dissipation: Analytical and Numerical Results
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- Enstrophy Cascade in Decaying Two-Dimensional Quantum Turbulence
- Persistent current oscillations in a double-ring quantum gas
- Dynamics of vortex quadrupoles in nonrotating trapped Bose-Einstein condensate
- Acoustic radiation from vortex-barrier interaction in atomic Bose-Einstein condensate
- From vortices to solitonic vortices in trapped atomic Bose-Einstein condensates
- A quantum storm in a teacup