Abstract
With the recent discovery of the quantum anomalous Hall insulator (QAHI), which exhibits the conductive quantum Hall edge states without external magnetic field, it becomes possible to create a topological superconductor (SC) by introducing superconductivity into these edge states. In this case, 2 distinct topological superconducting phases with 1 or 2 chiral Majorana edge modes were theoretically predicted, characterized by Chern numbers (N) of 1 and 2, respectively. We present spectroscopic evidence from Andreev reflection experiments for the presence of chiral Majorana modes in an Nb/(Cr0.12Bi0.26Sb0.62)2Te3heterostructure with distinct signatures attributed to 2 different topological superconducting phases. The results are in qualitatively good agreement with the theoretical predictions.
Funder
Research Grants Council, University Grants Committee
Croucher Foundation
Tai-chin Lo Foundation
ARO Multiple University Research Initiative
Energy Frontier Research Center
National Natural Science Foundation of China
National Key R&D Program of China
National Thousand-Young Talents Program in China
US National Science Foundation
Publisher
Proceedings of the National Academy of Sciences
Cited by
21 articles.
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