Elementary excitations of chiral Bose-Einstein condensates

Matthew James Edmonds; Manuel Valiente Cifuentes; Patrik Ohberg

doi:10.1209/0295-5075/110/36004

Elementary excitations of chiral Bose-Einstein condensates

Matthew James Edmonds, Manuel Valiente Cifuentes, Patrik Ohberg

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Abstract

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 language	English
Article number	36004
Journal	Europhysics Letters
Volume	110
Issue number	3
DOIs	https://doi.org/10.1209/0295-5075/110/36004
Publication status	Published - 27 May 2015

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Physics and Astronomy(all)

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AB - 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.

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Elementary excitations of chiral Bose-Einstein condensates

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