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

Junying Shen, Jian Lyu, Jason Z. Gao, Ying Ming Xie, Chui Zhen Chen, Chang woo Cho, Omargeldi Atanov, Zhijie Chen, Kai Liu, Yajian J. Hu, King Yau Yip, Swee K. Goh, Qing Lin He, Lei Pan, Kang L. Wang, Kam Tuen Law, Rolf Lortz

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)238-242
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume117
Issue number1
DOIs
Publication statusPublished - 2020 Jan 7

All Science Journal Classification (ASJC) codes

  • General

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