Finite Temperature Excitations of a trapped Bose gas by Feynman-Kac path integral approach

Details Finite Temperature Excitations of a trapped Bose gas by Feynman-Kac path integral approach Finite Temperature Excitations of a trapped Bose gas by Feynman-Kac path integral approach

2005-03-11

arxiv.org/abs/cond-mat/0503264v8

Physics

Condensed Matter

Other Condensed Matter

35pages,16figures

Scientific paper

We present results from a detailed Quantum Monte Carlo study of BEC applied to JILA experiment [Jin et al Phys. Rev. Lett. $\bf 78$, 764, 1997][1]. This is the first Monte Carlo approach(based on Feynman-Kac path integral method) to the above problem where good qualitative agreement is found for both the lowest lying $m=2$ and $m=0$ modes. We found an upward shift of the experimental data for $m=0$ mode at around $ T=0.7 T_0 $ ($T_0$ is defined as the predicted BEC transition temperature for harmonically confined ideal gas) when the effect of noncondensate was considered.

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