Collapses and Revivals of Collective Excitations in Trapped Bose Condensates

Details Collapses and Revivals of Collective Excitations in Trapped Bose Condensates Collapses and Revivals of Collective Excitations in Trapped Bose Condensates

1996-12-06

arxiv.org/abs/cond-mat/9612060v4

Physics

Condensed Matter

final version published in Phys.Rev.A (1997)

Scientific paper

We present a quantum theory of low-lying excitations in a trapped Bose condensate with finite particle numbers. We find that even at zero temperature condensate number fluctuations and/or fluctuations of the excitation frequency due to quantum uncertainties of the mode occupation lead to a collapse of the collective modes due to dephasing. Coherent revivals of the collective excitations are predicted on a much longer timescale. Depletion of collective modes due to second-harmonic generation is discussed.

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