Disordered quantum transport in quantum anomalous Hall insulator-superconductor junctions

Zhang, Jian-Xiao; Liu, Chao-Xing

doi:10.1103/physrevb.102.144513

Title: Disordered quantum transport in quantum anomalous Hall insulator-superconductor junctions

Journal Article · Thu Oct 15 00:00:00 EDT 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.102.144513· OSTI ID:1783179

Zhang, Jian-Xiao ^[1]; Liu, Chao-Xing ^[1]

Pennsylvania State Univ., University Park, PA (United States)

In this work we numerically studied disordered quantum transport in a quantum anomalous Hall insulator-superconductor junction based on the effective edge model approach. In particular, we focus on the parameter regime with the mean-free path due to elastic scattering much smaller than the sample size and superconductor coherence length, and discuss disordered transport behavior in the presence of different numbers of chiral edge modes, as well as nonchiral metallic modes. Our numerical results demonstrate that the presence of multiple chiral edge modes or nonchiral metallic modes will lead to a strong Andreev conversion, giving rise to half-electron half-hole transmission through the junction structure, in sharp contrast to the suppression of Andreev conversion in the single chiral edge mode case. Finally, our results suggest the importance of additional transport modes in the quantum anomalous Hall insulator-superconductor junction and will guide future transport measurements.

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Research Organization:: Pennsylvania State Univ., University Park, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019064

OSTI ID:: 1783179

Journal Information:: Physical Review B, Vol. 102, Issue 14; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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