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Majorana zero modes (MZM) are key component for realizing topological quantum computing. They are predicted to exist in the vortex core of a topological superconductor, and manifest themselves as a zero-bias conductance peak (ZBCP) in the tunneling spectroscopy. However, in practice, clean MZMs are difficult to realize due to contamination from other closely-packed high-level CdGM states or impurity states, which hampers further manipulations of MZMs. In this talk, I will present our recent low-T STM study on the vortex states of (Li0.84Fe0.16)OHFeSe (Tc~40K). We observed a ZBCP well separated from the other discrete CdGM states in the free vortex cores of (Li0.84Fe0.16)OHFeSe. Moreover, a Dirac-cone-type surface state is observed by angle-resolved photoemission spectroscopy, and its topological nature is confirmed by band calculations. The observed ZBCP can be naturally attributed to a MZM arising from this chiral topological surface states of a bulk superconductor. I will also briefly discuss related results on the vortex state of single layer FeSe/STO.
Professor Tong Zhang, Fudan University. In 2010, he obtained Ph.D degree from institute of physics, Chinese Academia of Sciences. Professor Zhang’s research includes scanning tunneling microscopic investigation and molecular beam epitaxial growth of quantum material, e.g. ultra-thin superconductor, unconventional superconductor, topological matters. He has published 38 papers, total citation is more than 3000 times.