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 2106.01909cond-mat.supr-con
收藏

超导二极管效应与有限动量超导

Supercurrent diode effect and finite momentum superconductivity

Noah F. Q. Yuan, Liang Fu

摘要:

当反转和时间反转对称性都被打破时,超导体的临界电流可以是非互易的。在这项工作中,我们表明,在某些类别的二维超导体反对称自旋轨道耦合,库珀对获得有限的动量后,应用的平面内磁场,因此,临界电流的方向平行和反平行的库珀对动量变得不平等。这种超电流二极管效应也表现在由超电流引起的面内临界场的极性依赖性中。这些非互易效应可以在极性SrTiO $_3$膜、处于$T_d$相的少层MoTe $_2$以及其中谷自由度起类似于自旋的作用的扭曲双层石墨烯中发现。

英文摘要:

When both inversion and time-reversal symmetries are broken, the critical current of a superconductor can be nonreciprocal. In this work we show that in certain classes of two-dimensional superconductors with antisymmetric spin-orbit coupling, Cooper pairs acquire a finite momentum upon the application of an in-plane magnetic field, and as a result, critical currents in the direction parallel and antiparallel to the Cooper pair momentum become unequal. This supercurrent diode effect is also manifested in the polarity-dependence of in-plane critical fields induced by a supercurrent. These nonreciprocal effects may be found in polar SrTiO$_3$ film, few-layer MoTe$_2$ in the $T_d$ phase, and twisted bilayer graphene in which the valley degrees of freedom plays the role analogous to spin.

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。

↑