Collective excitations of a quasi two-dimensional BEC: beyond mean field theory
Department of Physics, Cochin University of Science
and Technology, 682022
Received in final form: 5 November 2012
Published online: 5 April 2013
Collective excitations of a quasi two dimensional Bose-Einstein Condensate, which is subjected to an effective potential including beyond mean field effects, are studied. In the mean field regime, the sudden increase of the collective excitation frequency to infinity, indicating a collapse of the condensate is followed by its reappearance. It is found that the beyond mean field modifications prevent the reappearance of the excitation frequencies. Modifications in the potential are also found to prevent both attractively and repulsively interacting condensates from supporting the constant frequency breathing mode.
Key words: Cold Matter and Quantum Gas
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2013