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

Shen, Junying1; Lyu, Jian1,2; Gao, Jason Z.1; Xie, Ying-Ming1; Chen, Chui-Zhen1; Cho, Chang-woo1; Atanov, Omargeldi1; Chen, Zhijie3,4; Liu, Kai3,4; Hu, Yajian J.5; Yip, King Yau5; Goh, Swee K.5; He, Qing Lin6,7; Pan, Lei6,8,9; Wang, Kang L.6,8,9; Law, Kam Tuen1; Lortz, Rolf1

2020-01-07

10.1073/pnas.1910967117

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   影响因子和分区

0027-8424

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)(2)Te-3 heterostructure with distinct signatures attributed to 2 different topological superconducting phases. The results are in qualitatively good agreement with the theoretical predictions.

topological superconductivity Majorana fermion Andreev reflection

SCI

英语

NI论文

其他

US NSF[DMR-1610060] ; US NSF[DMR-1905468]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:000506001200040

NATL ACAD SCIENCES

BIOLOGY & BIOCHEMISTRY;CLINICAL MEDICINE;MULTIDISCIPLINARY;PLANT & ANIMAL SCIENCE;ENVIRONMENT/ECOLOGY;SOCIAL SCIENCES, GENERAL;MICROBIOLOGY;ECONOMICS BUSINESS;IMMUNOLOGY;MATERIALS SCIENCE;MATHEMATICS;SPACE SCIENCE;MOLECULAR BIOLOGY & GENETICS;PHARMACOLOGY & TOXICOLOGY;CHEMISTRY;PSYCHIATRY/PSYCHOLOGY;NEUROSCIENCE & BEHAVIOR;PHYSICS;GEOSCIENCES;AGRICULTURAL SCIENCES;ENGINEERING

Web of Science

1.Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China
2.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
3.Univ Calif Davis, Phys Dept, Davis, CA 95616 USA
4.Georgetown Univ, Phys Dept, Washington, DC 20057 USA
5.Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China
6.Univ Calif Los Angeles, Dept Elect & Comp Engn, Los Angeles, CA 90095 USA
7.Peking Univ, Sch Phys, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
8.Univ Calif Los Angeles, Dept Phys, Los Angeles, CA 90095 USA
9.Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA

Shen, Junying,Lyu, Jian,Gao, Jason Z.,et al. Spectroscopic fingerprint of chiral Majorana modes at the edge of a quantum anomalous Hall insulator/superconductor heterostructure[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2020,117(1):238-242.

Shen, Junying.,Lyu, Jian.,Gao, Jason Z..,Xie, Ying-Ming.,Chen, Chui-Zhen.,...&Lortz, Rolf.(2020).Spectroscopic fingerprint of chiral Majorana modes at the edge of a quantum anomalous Hall insulator/superconductor heterostructure.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,117(1),238-242.

Shen, Junying,et al."Spectroscopic fingerprint of chiral Majorana modes at the edge of a quantum anomalous Hall insulator/superconductor heterostructure".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 117.1(2020):238-242.