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arXiv 1111.0517cond-mat.quant-gascond-mat.supr-con
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弱排斥区的非平衡超冷费米气体:p波超流性的重整化群方法

Imbalanced ultracold Fermi gas in the weakly repulsive regime: Renormalization group approach for p-wave superfluidity

Shao-Jian Jiang, Xiao-Lu Yu, W. M. Liu

摘要:

从理论上研究了具有短程排斥作用的二维布居不平衡费米气体的一种可能的新配对机制,这种配对机制可以在费什巴赫共振的上支上实现.我们使用一个控制良好的重整化群方法,它允许一个不带假设的对称性破缺的非平衡费米液体的不稳定性的无偏研究,并给出了从微观参数的转变温度的数值计算。我们的研究结果表明,领先的超流不稳定性的p波通道的大多数物种。相应的机制是少数物种的粒子-空穴磁化率引起的多数物种之间存在有效的吸引相互作用,其中两种物种费米面的失配起着重要的作用。我们还提出了一个实验方案,用于检测p波超流性,并讨论了相应的实验签名。

英文摘要:

We theoretically study a possible new pairing mechanism for a two-dimensional population imbalanced Fermi gas with short-range repulsive interactions which can be realized on the upper branch of a Feshbach resonance. We use a well-controlled renormalization group approach, which allows an unbiased study of the instabilities of imbalanced Fermi liquid without assumption of a broken symmetry and gives a numerical calculation of the transition temperature from microscopic parameters. Our results show a leading superfluid instability in the p-wave channel for the majority species. The corresponding mechanism is that there are effective attractive interactions for the majority species, induced by the particle-hole susceptibility of the minority species, where the mismatch of the Fermi surfaces of the two species plays an important role. We also propose an experimental protocol for detecting the p-wave superfluidity and discuss the corresponding experimental signatures.

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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