Density excitations of a harmonically trapped ideal gas

Details Density excitations of a harmonically trapped ideal gas Density excitations of a harmonically trapped ideal gas

2009-12-15

arxiv.org/abs/0912.2849v1

Pramana 74 (2010) 83-96

Physics

Condensed Matter

Quantum Gases

Scientific paper

The dynamic structure factor of a harmonically trapped Bose gas has been calculated well above the Bose-Einstein condensation temperature by treating the gas cloud as a canonical ensemble of noninteracting classical particles. The static structure factor is found to vanish as wavenumber squared in the long-wavelength limit. We also incorporate a relaxation mechanism phenomenologically by including a stochastic friction force to study the dynamic structure factor. A significant temperature dependence of the density-fluctuation spectra is found. The Debye-Waller factor has been calculated for the trapped thermal cloud as function of wavenumber and of particle number. A substantial difference is found between clouds of small and large particle number.

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