Quantum perfect crossed Andreev reflection in top-gated quantum anomalous Hall insulator-superconductor junctions

Article

关键词: COOPER-PAIR SPLITTER;    TOPOLOGICAL INSULATOR;    ENTANGLEMENT;    STATE;    DOT;   

DOI  :  10.1103/PhysRevB.95.245433

来源: SCIE

【 摘 要 】

We investigate the quantum tunneling and Andreev reflection in a top-gated quantum anomalous Hall insulator proximity coupled with a superconductor junction. A quantized perfect crossed Andreev reflection with its coefficient being integer 1 is obtained and all other scattering processes (the normal reflection, normal tunneling, and local Andreev reflection) are completely suppressed when the topological superconductor phase with Chern number N = 1 is realized. This perfect crossed Andreev reflection originates from the tunneling of the chiral Majorana edge states, and the phase of tunneling amplitude only being 0 and pi plays a decisive role. Furthermore, because of the chiral characteristic of the Majorana edge states, the perfect crossed Andreev reflection is robust against the disorder and can work in a wide range of system parameters.

【 授权许可】

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