论文标题
混合平价超导体/铁磁性结构的各向异性差分电导
Anisotropic differential conductance of a mixed parity superconductor/ferromagnet structure
论文作者
论文摘要
我们研究具有连接到铁磁金属（F）的混合S+P波配对的超导体的电子传输性能和SFN构型中的正常电极（N）。使用准经典绿色的函数方法，我们计算结的差分电导$σ$，并证明了其对交换场的方向相对于对势的D-Vector的方向的依赖性。如果p波三重态主导配对，则零偏置电导取决于三重态D-vector和交换场之间的相对方向。相反，如果S波单线主导配对，则零偏置电导相对于场方向是各向同性的。此外，在零温度下，零偏置电导高度只能将两个值作为$ r $的函数，该参数量化了S-和P波配对的相对量，突然变化在$ r = 1 $时，当超导体从单点到三重三重的三重三分线主导地面状态。此外，我们表明，可以从有限偏置电导对交换场方向的依赖性中估计S-和P波配对的相对量。我们的结果提供了一种表征执行电测量的平均混合超导体的方法。
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 $σ$ 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.
