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arXiv 1102.5472cond-mat.quant-gasquant-ph
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有限温度下囚禁偶极费米气体的动力学性质

Dynamical properties of a trapped dipolar Fermi gas at finite temperature

J. -N. Zhang, R. -Z. Qiu, L. He, S. Yi

摘要:

本文研究了有限温度正常费米气体在偶极-偶极相互作用下的动力学性质。对于自由膨胀动力学,我们表明,膨胀气体总是成为拉伸沿方向的偶极矩。此外,我们提出了温度和相互作用的渐近纵横比的依赖性。通过突然增加偶极相互作用强度,我们进一步研究了系统的坍缩动力学。我们发现,与偶极玻色-爱因斯坦凝聚体的各向异性坍缩相反,当系统变得全局不稳定时,偶极费米气体总是各向同性坍缩。我们还探讨了相互作用和温度的依赖性的频率低的集体激发。

英文摘要:

We investigate the dynamical properties of a trapped finite-temperature normal Fermi gas with dipole-dipole interaction. For the free expansion dynamics, we show that the expanded gas always becomes stretched along the direction of the dipole moment. In addition, we present the temperature and interaction dependences of the asymptotical aspect ratio. We further study the collapse dynamics of the system by suddenly increasing the dipolar interaction strength. We show that, in contrast to the anisotropic collapse of a dipolar Bose-Einstein condensate, a dipolar Fermi gas always collapses isotropically when the system becomes globally unstable. We also explore the interaction and temperature dependences for the frequencies of the low-lying collective excitations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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