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Majorana fermion (MF) whose antiparticle is itself has been predicted incondensed matter systems. Signatures of the MFs have been reported as zeroenergy modes in various systems. More definitive evidences are highly desiredto verify the existence of the MF. Very recently, theory has predicted MFs toinduce spin selective Andreev reflection (SSAR), a novel magnetic propertywhich can be used to detect the MFs. Here we report the first observation ofthe SSAR from MFs inside vortices in Bi2Te3/NbSe2 hetero-structure, in whichtopological superconductivity was previously established. By usingspin-polarized scanning tunneling microscopy/spectroscopy (STM/STS), we showthat the zero-bias peak of the tunneling differential conductance at the vortexcenter is substantially higher when the tip polarization and the externalmagnetic field are parallel than anti-parallel to each other. Such strong spindependence of the tunneling is absent away from the vortex center, or in aconventional superconductor. The observed spin dependent tunneling effect is adirect evidence for the SSAR from MFs, fully consistent with theoreticalanalyses. Our work provides definitive evidences of MFs and will stimulate theMFs research on their novel physical properties, hence a step towards theirstatistics and application in quantum computing.

Observation of Majorana fermions with spin selective Andreev reflection in the vortex of topological superconductor