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24 April 2024 |
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Article overview
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Observation of Majorana fermions with spin selective Andreev reflection in the vortex of topological superconductor | | Hao-Hua Sun
; Kai-Wen Zhang
; Lun-Hui Hu
; Chuang Li
; Guan-Yong Wang
; Hai-Yang Ma
; Zhu-An Xu
; Chun-Lei Gao
; Dan-Dan Guan
; Yao-Yi Li
; Canhua Liu
; Dong Qian
; Yi Zhou
; Liang Fu
; Shao-Chun Li
; Fu-Chun Zhang
; Jin-Feng Jia
; | | Date: |
8 Mar 2016 | | Abstract: | Majorana fermion (MF) whose antiparticle is itself has been predicted in
condensed matter systems. Signatures of the MFs have been reported as zero
energy modes in various systems. More definitive evidences are highly desired
to verify the existence of the MF. Very recently, theory has predicted MFs to
induce spin selective Andreev reflection (SSAR), a novel magnetic property
which can be used to detect the MFs. Here we report the first observation of
the SSAR from MFs inside vortices in Bi2Te3/NbSe2 hetero-structure, in which
topological superconductivity was previously established. By using
spin-polarized scanning tunneling microscopy/spectroscopy (STM/STS), we show
that the zero-bias peak of the tunneling differential conductance at the vortex
center is substantially higher when the tip polarization and the external
magnetic field are parallel than anti-parallel to each other. Such strong spin
dependence of the tunneling is absent away from the vortex center, or in a
conventional superconductor. The observed spin dependent tunneling effect is a
direct evidence for the SSAR from MFs, fully consistent with theoretical
analyses. Our work provides definitive evidences of MFs and will stimulate the
MFs research on their novel physical properties, hence a step towards their
statistics and application in quantum computing. | | Source: | arXiv, 1603.2549 | | Services: | Forum | Review | PDF | Favorites | |
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