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High-Tc Superconductor Fe(Se,Te) Monolayer: an Intrinsic, Scalable and Electrically-tunable Majorana Platform

Date: 2019-09-27
Time: 10:00
Venue: M253
Speaker: Dr.Xianxin Wu

Würzburg University, Germany


A monolayer of the high-Tc superconductor FeTe1−xSex has been predicted to realize a topologically non-trivial state with helical edge modes at its boundary, providing a novel intrinsic system to search for topological superconductivity and Majorana zero modes. Evidence in favor of a topological phase transition and helical edge modes has been given in recent experiments. We propose to create Majorana zero modes by applying an in-plane magnetic field to the FeTe1−xSex monolayer and by tuning the local chemical potential via electric gating. We demonstrate that, for appropriate parameter regimes, Majorana zero modes can exist at several different locations, including the corner between two perpendicular edges, the domain wall of chemical potentials at one edge, and certain type of tri-junction in the 2D bulk. The scalability and electrical tunability of our proposal render FeTe1−xSex monolayer an promising Majorana platform which is in reach of contemporary experimental capability.

Brief CV of Dr.Xianxin Wu:

Dr. Xianxin Wu obtained his Ph.D. degree from the Institute of Physics, Chinese Academy of Sciences in 2016. Since then, he has been working as a postdoctoral researcher at Würzburg University in Germany. His research interests mainly include unconventional superconductivity, topological superconductivity and novel topological phases of matter.