Collapses and revivals of collective excitations in trapped Bose condensates

R. Graham; D. F. Walls; M. J. Collett; M. Fliesser; E. M. Wright

doi:10.1103/PhysRevA.57.503

Collapses and revivals of collective excitations in trapped Bose condensates

R. Graham, D. F. Walls, M. J. Collett, M. Fliesser, E. M. Wright

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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 time scale. Depletion of collective modes due to second-harmonic generation is discussed.

Original language	English (US)
Pages (from-to)	503-510
Number of pages	8
Journal	Physical Review A - Atomic, Molecular, and Optical Physics
Volume	57
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevA.57.503
State	Published - 1998

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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10.1103/PhysRevA.57.503

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AU - Walls, D. F.

AU - Collett, M. J.

AU - Fliesser, M.

AU - Wright, E. M.

PY - 1998

Y1 - 1998

N2 - 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 time scale. Depletion of collective modes due to second-harmonic generation is discussed.

AB - 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 time scale. Depletion of collective modes due to second-harmonic generation is discussed.

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Collapses and revivals of collective excitations in trapped Bose condensates

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