Bose-Einstein condensation temperature of dipolar gas in anisotropic harmonic trap

被引:23
|
作者
Glaum, K.
Pelster, A.
机构
[1] Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany
[2] Univ Duisburg Essen, Fachbereich Phys, D-47048 Duisburg, Germany
来源
PHYSICAL REVIEW A | 2007年 / 76卷 / 02期
关键词
D O I
10.1103/PhysRevA.76.023604
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We consider a dilute gas of dipole moments in an arbitrary harmonic trap and treat both the short-range, isotropic delta interaction and the long-range, anisotropic dipole-dipole interaction perturbatively. In this way, we calculate the leading shift of the critical temperature with respect to that of an ideal gas as a function of the relative orientation of the dipole moments with respect to the harmonic trap axes. In particular, we determine those magic angles, where the dipolar shift of the Bose-Einstein condensation temperature vanishes. Furthermore, we show for the parameters of the ongoing Cr-52 BEC experiment of Pfau and co-workers that this dipolar shift can be enhanced by increasing the number of particles, the geometrical mean trap frequency, and the anisotropy of the trap.
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页数:11
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