Elementary excitations of trapped Bose gas in the large-gas-parameter regime

Details Elementary excitations of trapped Bose gas in the large-gas-parameter regime Elementary excitations of trapped Bose gas in the large-gas-parameter regime

2002-08-30

arxiv.org/abs/cond-mat/0208606v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

17 pages with 4 figures. To be published in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.66.043609

We study the effect of going beyond the Gross-Pitaevskii theory on the frequencies of collective oscillations of a trapped Bose gas in the large gas parameter regime. We go beyond the Gross-Pitaevskii regime by including a higher-order term in the interatomic correlation energy. To calculate the frequencies we employ the sum-rule approach of many-body response theory coupled with a variational method for the determination of ground-state properties. We show that going beyond the Gross-Pitaevskii approximation introduces significant corrections to the collective frequencies of the compressional mode.

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