Double Andreev reflections at surface states of the topological insulators with hexagonal warping
Double Andreev reflections at surface states of the topological insulators with hexagonal warping
复制标题
六边形翘曲拓扑绝缘体表面态的双安德烈夫反射
DOI：
10.1007/s11467-019-0941-0
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发表时间：
2020
影响因子：
7.5
通讯作者：
Wang Rui-Qiang
中科院分区：
文献类型：
--
作者：
Zhu Chang-Yong;Zheng Shi-Han;Duan Hou-Jian;Deng Ming-Xun;Wang Rui-Qiang
研究了六角弯曲拓扑绝缘体与超导结界面处的Andreev反射。由于六边形翘曲效应，在一定的入射角范围内发现了双AR，其中对于一个入射电子束，两个空穴束被反射回来。有趣的是，两个孔的光束在界面法线的同一侧反射为逆AR，但具有不同的反射角，不同于先前报道的具有一个逆AR和一个镜面AR的双AR。翘曲效应引起的双反射反映了狄拉克费米子的类光学性质，并能激发光在各向异性晶体中的双反射。此外，我们还发现双AR非单调地依赖于六边形翘曲参数，并且在中等强度下双AR现象突出，为探索拓扑绝缘体的翘曲参数提供了可能.
We study the Andreev reflection (AR) at the interface of the topological insulator with hexagonal warping and superconductor junction. Due to the hexagonal warping effect, the double ARs are found in a certain range of the incident angle, where for one incident electron beam, two beams of holes are reflected back. Interestingly, both the beams of holes are reflected as retro-AR on the same side of the normal line of the interface but with different reflection angles, different from the previously reported double AR with one retro-AR and one specular-AR. The double reflections owing to the warping effect show the optics-like property of the Dirac fermion and can stimulate the double reflections of light in anisotropic crystals. In addition, we find that the double ARs are dependent on the hexagonal warping parameter nonmonotonically, and in an intermediate strength the double AR phenomenon is prominent, providing a possibility to explore the warping parameter of topological insulators.