Title: Anisotropic differential conductance of a mixed parity superconductor/ferromagnet structure Show Chinese title

Title: 混合奇偶性超导体/铁磁结构的各向异性微分电导

Abstract: We study the electronic transport properties of a superconductor (S) with a mixed s+p-wave pairing attached to a ferromagnetic metal (F) and a normal electrode (N) in an SFN configuration. Using the quasiclassical Green's function method, we compute the differential conductance $\sigma$ of the junction and demonstrate its dependence on the direction of the exchange field relative to the direction of the d-vector of the pair potential. If the p-wave triplet dominates the pairing, the zero bias conductance depends on the relative direction between the triplet d-vector and the exchange field. In contrast, if the s-wave singlet dominates the pairing, the zero bias conductance is isotropic with respect to the field direction. Furthermore, at zero temperature, the zero bias conductance height can only take two values as a function of $r$, the parameter quantifying the relative amount of s- and p-wave pairing, with an abrupt change at $r=1$ when the superconductor goes from a singlet to triplet dominated ground state. Moreover, we show that the relative amount of s- and p-wave pairing, can be estimated from the dependence of the finite bias conductance on the exchange field direction. Our results provide a way to characterize parity-mixed superconductors performing electrical measurements. Show Chinese abstract

Abstract: 我们研究了在SFN结构中，一个具有混合s+p波配对的超导体（S）连接到铁磁金属（F）和正常电极（N）的电子输运特性。 使用准经典格林函数方法，我们计算了结的微分电导$\sigma$，并展示了其相对于配对势的d矢量方向的交换场方向的依赖性。 如果p波三重态主导配对，则零偏压电导取决于三重态d矢量与交换场之间的相对方向。 相反，如果s波单重态主导配对，则零偏压电导相对于场方向是各向同性的。 此外，在零温度下，零偏压电导高度仅能随着$r$（量化s波和p波配对相对量的参数）的变化而取两个值，并且当超导体从单重态主导的基态变为三重态主导的基态时，在$r=1$处出现突变。 此外，我们表明，可以通过有限偏压电导对交换场方向的依赖性来估计s波和p波配对的相对量。 我们的结果提供了一种通过电气测量表征奇偶混合超导体的方法。