We investigate Andreev reflection properties contributed by the Majorana doublets, by introducing two ferromagnetic leads coupled to the ends of the time-reversal-invariant topological superconducting nanowire. It is found that the local and crossed Andreev reflections are influenced by the polarization strengths and directions in the ferromagnetic leads. This directly leads to the dependence of the shot noise Fano factors on the ferromagnetic leads, as well as their correspondence to the Andreev conductances. In addition, the coupling manners between the Majorana doublets and leads take effects to the conductance and Fano factors. This work provides useful information for the understanding of the Andreev reflection properties of Majorana doublets.

我们通过引入两个与时间反转不变拓扑超导纳米线末端耦合的铁磁引线来研究马约拉纳双峰贡献的 Andreev 反射特性。发现局部和交叉的 Andreev 反射受铁磁引线中极化强度和方向的影响。这直接导致散粒噪声 Fano 因子对铁磁引线的依赖性，以及它们与 Andreev 电导的对应关系。此外，Majorana 双峰和引线之间的耦合方式对电导和 Fano 因子有影响。这项工作为理解 Majorana 双峰的 Andreev 反射特性提供了有用的信息。