Chiral Majorana fermion modes in a quantum anomalous Hall insulator–superconductor structure

Author:

He Qing Lin1ORCID,Pan Lei1,Stern Alexander L.2,Burks Edward C.3,Che Xiaoyu1,Yin Gen1,Wang Jing45ORCID,Lian Biao5,Zhou Quan5ORCID,Choi Eun Sang6,Murata Koichi1,Kou Xufeng17ORCID,Chen Zhijie3ORCID,Nie Tianxiao1ORCID,Shao Qiming1ORCID,Fan Yabin1,Zhang Shou-Cheng5ORCID,Liu Kai3ORCID,Xia Jing2,Wang Kang L.18ORCID

Affiliation:

1. Department of Electrical and Computer Engineering, Department of Physics, and Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA.

2. Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA.

3. Physics Department, University of California, Davis, CA 95616, USA.

4. State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China.

5. Department of Physics, Stanford University, Stanford, CA 94305, USA.

6. National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310-3706, USA.

7. School of Information Science and Technology, ShanghaiTech University, Shanghai 200031, China.

8. King Abdulaziz City for Science and Technology (KACST), Center of Excellence in Green Nanotechnology, Riyadh, Saudi Arabia.

Abstract

A propagating Majorana mode Although Majorana fermions remain elusive as elementary particles, their solid-state analogs have been observed in hybrid semiconductor-superconductor nanowires. In a nanowire setting, the Majorana states are localized at the ends of the wire. He et al. built a two-dimensional heterostructure in which a one-dimensional Majorana mode is predicted to run along the sample edge (see the Perspective by Pribiag). The heterostructure consisted of a quantum anomalous Hall insulator (QAHI) bar contacted by a superconductor. The authors used an external magnetic field as a “knob” to tune into a regime where a Majorana mode was propagating along the edge of the QAHI bar covered by the superconductor. A signature of this propagation—half-quantized conductance—was then observed in transport experiments. Science , this issue p. 294 ; see also p. 252

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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