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Tunable-phi Josephson junction with a quantum anomalous Hall insulator

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Title: Tunable-phi Josephson junction with a quantum anomalous Hall insulator
Authors: Sakurai, Keimei Browse this author
Ikegaya, Satoshi Browse this author
Asano, Yasuhiro Browse this author →KAKEN DB
Issue Date: 27-Dec-2017
Publisher: American Physical Society (APS)
Journal Title: Physical Review B
Volume: 96
Issue: 22
Start Page: 224514
Publisher DOI: 10.1103/PhysRevB.96.224514
Abstract: 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 current J flows without a phase difference across the junction theta. The phase shift phi appearing in the current-phase relationship J alpha sin(theta - phi) is proportional to the amplitude of Zeeman fields and depends on the direction ofZeeman fields. Aphenomenological analysis of the Andreev reflection processes explains the physical origin of phi. 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 tunable phi junction with a quantum Hall insulator.
Rights: ©2017 American Physical Society
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 浅野 泰寛

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