Quadrupole collective modes in trapped finite-temperature Bose-Einstein condensates

Details Quadrupole collective modes in trapped finite-temperature Bose-Einstein condensates Quadrupole collective modes in trapped finite-temperature Bose-Einstein condensates

2002-01-08

arxiv.org/abs/cond-mat/0201115v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.88.180402

Finite temperature simulations are used to study quadrupole excitations of a trapped Bose-Einstein condensate. We focus specifically on the m=0 mode, where a long-standing theoretical problem has been to account for an anomalous variation of the mode frequency with temperature. We explain this behavior in terms of the excitation of two separate modes, corresponding to coupled motion of the condensate and thermal cloud. The relative amplitudes of the modes depends sensitively on the temperature and on the frequency of the harmonic drive used to excite them. Good agreement with experiment is found for appropriate drive frequencies.

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