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Spectroscopic fingerprint of chiral Majorana modes at the edge of a quantum anomalous Hall insulator/superconductor heterostructure.

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)2Te3 heterostructure with distinct signatures attributed to 2 different topological superconducting phases. The results are in qualitatively good agreement with the theoretical predictions.

SUBMITTER: Shen J 

PROVIDER: S-EPMC6955289 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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Spectroscopic fingerprint of chiral Majorana modes at the edge of a quantum anomalous Hall insulator/superconductor heterostructure.

Shen Junying J   Lyu Jian J   Gao Jason Z JZ   Xie Ying-Ming YM   Chen Chui-Zhen CZ   Cho Chang-Woo CW   Atanov Omargeldi O   Chen Zhijie Z   Liu Kai K   Hu Yajian J YJ   Yip King Yau KY   Goh Swee K SK   He Qing Lin QL   Pan Lei L   Wang Kang L KL   Law Kam Tuen KT   Lortz Rolf R  

Proceedings of the National Academy of Sciences of the United States of America 20191218 1

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 ev  ...[more]

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