High-Tc superconductor Fe(Se,Te) Monolayer: an intrinsic, scalable and electrically-tunable majorana platform

Abstract

Abstract Iron based superconductors have been identified as a novel platform for realizing Majorana zero modes (MZMs) without heterostructures, due to their intrinsic topological properties and high Tc superconductivity. In the two-dimensional limit, FeTe1 − xSex monolayer, a topological band inversion has been experimentally observed recently. Here, we propose to create MZMs by applying an in-plane magnetic field to the FeTe1 − xSex monolayer and tuning the local chemical potential via electric gating. Owing to the anisotropic magnetic couplings on edges, an in-plane magnetic field drives the system into an intrinsic high-order topological superconductor phase with Majorana corner modes. Furthermore, MZMs can occur at the domain wall of chemical potentials at one edge and certain type of tri-junction in the 2D bulk. Our study not only demonstrates FeTe1 − xSex monolayer as a promising Majorana platform with scalability and electrical tunability and within reach of contemporary experimental capability, but also provides a general principle to search for realistic realization of high-order topological superconductivity.