Elementary excitations of chiral Bose-Einstein condensates

Matthew James Edmonds, Manuel Valiente Cifuentes, Patrik Ohberg

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21 Citations (Scopus)
50 Downloads (Pure)


We study the collective modes of a Bose-Einstein condensate subject to an optically induced density-dependent gauge potential. The corresponding interacting gauge theory lacks Galilean invariance, yielding an exotic superfluid state. The nonlinear dynamics in the presence of a current nonlinearity and an external harmonic trap are found to give rise to dynamics which violate Kohn's theorem; where the frequency of the dipole mode strongly depends on the strength of the mass current in the gas. The linearised spectrum reveals how the centre of mass and shape oscillations are coupled, whereas in the strongly nonlinear regime the dynamics are irregular.

Original languageEnglish
Article number36004
JournalEurophysics Letters
Issue number3
Publication statusPublished - 27 May 2015

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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