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】
Free