arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0709.0388cond-mat.supr-concond-mat.mes-hall
收藏

超流体与极化费米气体之间涨落界面的效应

Effects of a Fluctuating Interface between a Superfluid and a Polarized Fermi Gas

Hui Zhai, Dung-Hai Lee

摘要:

基于最近在自旋布居不平衡的囚禁费米气体中的实验,我们讨论了完全成对的超流核和完全极化的费米气体之间界面的量子涨落和热涨落的影响。我们证明,即使在体相中不存在真正的部分极化热力学相,界面涨落也可以引起陷阱中的部分极化过渡区。我们的理论产生了一个明确的预测自旋极化和配对间隙的空间分布的函数形式,我们表明,由MIT和赖斯集团测量的自旋分辨密度分布服从此函数形式。我们还表明,足够大的波动将导致一个明显的不均匀的密度,即使在云的中心。我们希望这张照片可以揭示最近实验中有争议的差异。

英文摘要:

Motivated by recent experiments in trapped Fermi gas with spin population imbalance, we discuss the effects of the quantum and thermal fluctuations of the interface between a fully paired superfluid core and a fully polarized Fermi gas. We demonstrate that even if there is no true partially polarized thermodynamic phase in bulk, the interface fluctuation can give rise to a partially polarized transition regime in trap. Our theory yields a definite prediction for the functional forms of the spatial profile of spin polarization and pairing gap, and we show that the spin-resolved density profiles measured by both the MIT and Rice groups obey this function form. We also show that sufficient large fluctuation will lead to a visibly unequal density even at the center of the cloud. We hope this picture can shed lights on the controversial discrepancies in recent experiments.

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。

↑