Elementary excitations of trapped Bose gas in the large-gas-parameter regime
arXiv:cond-mat/0208606 · doi:10.1103/PhysRevA.66.043609
Abstract
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.
17 pages with 4 figures. To be published in Phys. Rev. A
References in corpus (9)
- Theory of Bose-Einstein condensation in trapped gases
- Stable 85Rb Bose-Einstein Condensates with Widely Tunable Interactions
- Ground state of a homogeneous Bose gas: a diffusion Monte Carlo calculation
- Elementary excitations in trapped Bose gases beyond mean field approximation
- Beyond Gross-Pitaevskii:local density vs. correlated basis approach for trapped bosons
- Bose-Einstein Condensates in the Large Gas Parameter Regime
- Semiclassical Corrections to the Oscillation Frequencies of a Trapped Bose-Enstein Condensate
- A Variational Sum-Rule Approach to Collective Excitations of a Trapped Bose-Einstein Condensate
- Ground state and vortex states of bosons in an anisotropic trap: A variational approach
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