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arXiv 1602.02741cond-mat.supr-concond-mat.mes-hallcond-mat.str-el
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Rashba与Kohn-Luttinger:自旋-轨道相互作用下磁化二维费米气体p波超导性的演化

Rashba versus Kohn-Luttinger: Evolution of p-wave superconductivity in magnetized two-dimensional Fermi gas subject to spin-orbit interaction

Ethan Lake, Caleb Webb, D. A. Pesin, O. A. Starykh

摘要:

我们研究了Rashba自旋-轨道相互作用如何影响磁场作用下部分自旋极化的二维电子气的非常规超导性。令人惊讶的是,我们发现,对于所有的场取向,只有较大的费米面是超导的。当磁场定向在平面外时,系统实现拓扑$p+ip$配对状态。当场在平面内旋转时,序参量沿场的方向发展出节点,实现了有限的质心动量配对。我们证明了由于各种热力学量对磁场几何的依赖性,系统的配对对称性可以很容易地在实验上探测,并计算了电子比热作为一个例子。

英文摘要:

We study how the Rashba spin-orbit interaction influences unconventional superconductivity in a two dimensional electron gas partially spin-polarized by a magnetic field. Somewhat surprisingly, we find that for all field orientations, only the larger Fermi surface is superconducting. When the magnetic field is oriented out-of-plane the system realizes a topological $p+ip$ pairing state. When the field is rotated in-plane the order parameter develops nodes along the field direction and finite center-of-mass-momentum pairing is realized. We demonstrate that the pairing symmetry of the system can be easily probed experimentally due to the dependence of various thermodynamic quantities on the magnetic field geometry, and calculate the electronic specific heat as an example.

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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