Coherent cross talk and parametric driving of matter-wave vortices

  1. Lookup NU author(s)
  2. Dr Nicholas Parker
  3. Dr Joy Allen
  4. Professor Carlo Barenghi
  5. Professor Nikolaos Proukakis
Author(s)Parker NG, Allen AJ, Barenghi CF, Proukakis NP
Publication type Article
JournalPhysical Review A
ISSN (print)1050-2947
ISSN (electronic)1094-1622
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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.
PublisherAmerican Physical Society
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