arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1301.0358cond-mat.quant-gascond-mat.str-el
收藏

简谐势阱中二维自旋1/2费米气体的集体模

Collective modes of a two-dimensional spin-1/2 Fermi gas in a harmonic trap

Stefan K. Baur, Enrico Vogt, Michael Köhl, Georg M. Bruun

摘要:

我们利用动力学理论推导出二维费米气体最低集体模的频率和阻尼的解析表达式。对于强耦合,我们还表明,配对相关过度补偿的影响泡利阻塞的碰撞率在很大的温度范围内,导致的速率大于经典气体。我们的研究结果与实验数据吻合良好,他们恢复所观察到的交叉从碰撞流体动力学行为与增加耦合的四重模式。最后,我们表明,实验范围内的陷阱各向异性会导致呼吸模式的阻尼,这与观察到的情况相当,即使对于尺度不变系统也是如此。

英文摘要:

We derive analytical expressions for the frequency and damping of the lowest collective modes of a two-dimensional Fermi gas using kinetic theory. For strong coupling, we furthermore show that pairing correlations overcompensate the effects of Pauli blocking on the collision rate for a large range of temperatures, resulting in a rate which is larger than that of a classical gas. Our results agree well with experimental data, and they recover the observed cross-over from collisionless to hydrodynamic behaviour with increasing coupling for the quadruple mode. Finally, we show that a trap anisotropy within the experimental bounds results in a damping of the breathing mode which is comparable to what is observed, even for a scale invariant system.

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。

↑