Low energy excitations of a quasi-2D Bose-Einstein condensate |
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| Authors: | Z-Ch Wang H-W Yang S Yin |
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| Institution: | (1) CCAST (World Lab.), P.O. Box 8730, Beijing 100080, P.R. China, CN;(2) Department of physics, Lanzhou University, Lanzhou 730000, P.R. China, CN |
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| Abstract: | Starting from the Gross-Pitaevskii energy functional of the 3D Bose-Einstein Condensate, we derive approximately the energy
functional and the effective coupling constant of the quasi-2D condensate. The evolution of the quasi-2D condensate wave function
is studied by a variational method. Low energy excitation spectra for both positive and negative scattering lengths are analyzed.
The condition of collapse instability of a quasi-2D Bose gas with attractive particle interaction is also proposed.
Received 31 October 2001 / Received in final form 1st March 2002 Published online 28 June 2002 |
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| Keywords: | PACS 03 75 Fi Phase coherent atomic ensembles quantum condensation phenomena – 03 65 Ge Solutions of wave equations: bound states |
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