APS Logo

High-T<sub>c</sub> Superconductor Fe(Se,Te) Monolayer: an Intrinsic, Scalable and Electrically-tunable Majorana Platform

ORAL

Abstract

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 a promising Majorana platform which is in reach of contemporary experimental capability.

–

Presenters

  • Xianxin Wu

    Institute for Theoretical Physics, University of Wuerzburg, Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Physics department, Pennsylvania State University, University of Wurzburg, Institut für Theoretische Physik und Astrophysik, University of Würzburg

Authors

  • Xianxin Wu

    Institute for Theoretical Physics, University of Wuerzburg, Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Physics department, Pennsylvania State University, University of Wurzburg, Institut für Theoretische Physik und Astrophysik, University of Würzburg

  • Xin Liu

    Physics department, Huazhong University of Science and Technology

  • Ronny Thomale

    University of Wurzburg, Institute for Theoretical Physics, University of Wuerzburg, Theoretical physics I, University of Wuerzburg, University of Wuerzburg, Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Physics department, University of Wuerzburg, Institut für Theoretische Physik und Astrophysik, University of Würzburg, Institute for Theoretical Physics and Astrophysics, University of Wurzburg

  • Chaoxing Liu

    Physics department, Pennsylvania State University, Pennsylvania State University