Tunable-φ Josephson junction with a quantum anomalous Hall insulator
Tunable-φ Josephson junction with a quantum anomalous Hall insulator
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具有量子反常霍尔绝缘体的可调谐 φ 约瑟夫森结
DOI：
10.1103/physrevb.96.224514
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发表时间：
2017
影响因子：
3.7
通讯作者：
Asano Yasuhiro
中科院分区：
文献类型：
--
作者：
Sakurai Keimei;Ikegaya Satoshi;Asano Yasuhiro
我们利用晶格格林函数技术从理论上研究了超导体/量子反常霍尔绝缘体/超导体结中的约瑟夫森电流。当面内外部塞曼场施加到量子反常霍尔绝缘体时，约瑟夫森电流在没有相位差的情况下流过结。电流-相位关系中出现的相移与塞曼场的幅度成正比并且取决于塞曼场的方向。安德列夫反射过程的现象学分析解释了其物理起源。在量子反常霍尔绝缘体中，时间反转对称性和镜面反射对称性同时破缺。然而，磁镜反射对称性得以保留。这种特征对称性使我们能够与量子霍尔绝缘体建立可调谐结。
We theoretically study the Josephson current in a superconductor/quantum anomalous Hall insulator/superconductor junction by using the lattice Green function technique. When an in-plane external Zeeman field is applied to the quantum anomalous Hall insulator, the Josephson currentflows without a phase difference across the junction. The phase shiftappearing in the current-phase relationship) is proportional to the amplitude of Zeeman fields and depends on the direction of Zeeman fields. A phenomenological analysis of the Andreev reflection processes explains the physical origin of. In a quantum anomalous Hall insulator, time-reversal symmetry and mirror-reflection symmetry are broken simultaneously. However, magnetic mirror-reflection symmetry is preserved. Such characteristic symmetry properties enable us to have a tunablejunction with a quantum Hall insulator.