拓扑绝缘体基铁磁/f-波超导隧道结Andreev反射研究

基于Bogoliubov-de Gennes方程和Blonder-Tinkham-Klapwijk理论研究了三维拓扑绝缘体基铁磁/各向异性f-波超导隧道结的Andreev反射，其中f-波超导体选取f₁和f₂-波两种配对势.研究发现，对于f₁和f₂波，铁磁体中的磁能隙可以增强传统的Andreev逆向反射，但对Andreev镜面反射有抑制作用；但随着施加在超导体顶部电极上的栅极电位的增加，两种类型的反射都会增强.通过改变磁能隙，可以调节两种反射在准粒子输运过程中占有优势的程度.这些结果提供了一种实验检测拓扑绝缘体薄膜中镜面Andreev反射的方法.此外，隧穿电导和散粒噪声谱的差异可用于区分f₁和f₂波配对势.

Study on Andreev Reflection of Topological Insulator-based Ferromagnetic/f-Wave Superconductor Junctions

The Andreev reflection of ferromagnetic/anisotropic /-wave superconductor tunnel junctions based on three-dimensional topological insulators was studied using the Bogoliubov-de Gennes equation and Blonder-Tinkham- Klapwijk theory. The /-wave superconductor selected two pairing potentials, f1 and f2 Research has found that for f1 and f2 waves, the magnetic energy gap in ferromagnet can enhance traditional Andreev retro-ref lection, but suppress specular Andreev reflection. The gate potential applied to the top electrode of the superconductor enhances both types of reflection. By changing the magnetic energy gap, the degree to which two types of reflections have an advantage in quasi particle transport can be adjusted. These results provide a method for experimentally detecting mirror reflection Andreev reflection in topological insulator films. In addition, the difference between tunneling conductance and shot noise spectrum can be used to distinguish between the pairing potentials of f1 and f2 waves.