High-T c superconductor Fe(Se,Te) monolayer: an intrinsic, scalable and electrically tunable Majorana platform
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, the FeTe1−xSex monolayer, a topological band inversion has recently been experimentally observed. 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 either one edge or certain type of tri-junction in the two-dimensional bulk. Our study not only reveals the 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 19, 2021
- Source ID
- 10.1093/nsr/nwab087
Entities
People
- Chao-xing Liu
- Ronny Thomale
- Xianxin Wu
- Xin Liu
Organizations
- German Research Foundation
- Huazhong University of Science and Technology
- Office of Naval Research
- Pennsylvania State University
- University of Würzburg