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Phys Rev Lett. 2016 Jun 24;116(25):257003. doi: 10.1103/PhysRevLett.116.257003. Epub 2016 Jun 21.

Majorana Zero Mode Detected with Spin Selective Andreev Reflection in the Vortex of a Topological Superconductor.

Sun HH1, Zhang KW2, Hu LH3,4, Li C3,4, Wang GY1, Ma HY1, Xu ZA3,4, Gao CL1,4, Guan DD1,4, Li YY1,4, Liu C1,4, Qian D1,4, Zhou Y3,4, Fu L5, Li SC2,4, Zhang FC3,4, Jia JF1,4.

Author information

1
Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
2
National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, China.
3
Department of Physics, Zhejiang University, Hangzhou 310027, Zhejiang, China.
4
Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
5
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA.

Abstract

Recently, theory has predicted a Majorana zero mode (MZM) to induce spin selective Andreev reflection (SSAR), a novel magnetic property which can be used to detect the MZM. Here, spin-polarized scanning tunneling microscopy or spectroscopy has been applied to probe SSAR of MZMs in a topological superconductor of the Bi_{2}Te_{3}/NbSe_{2} heterostructure. The zero-bias peak of the tunneling differential conductance at the vortex center is observed substantially higher when the tip polarization and the external magnetic field are parallel rather than antiparallel to each other. This spin dependent tunneling effect provides direct evidence of MZM and reveals its magnetic property in addition to the zero energy modes. Our work will stimulate MZM research on these novel physical properties and, hence, is a step towards experimental study of their statistics and application in quantum computing.

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