Collapses and Revivals of Collective Excitations in Trapped Bose Condensates

1996/12/06 by R. Graham, Graham, R., D. F. Walls +7
Physics and Astronomy · #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #Condensed Matter (cond-mat) #FOS: Physical sciences #Quantum, superfluid, helium dynamics

paper · pdf · doi:10.48550/arxiv.cond-mat/9612060

openalex publication_date 1996/12/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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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