Tunable topological states in antiferromagnetic MnSb4Se7 material

Abstract

Magnetic topological insulators (MTIs) of the MnBi2xTe3x+1 family, discovered in recent years, have been successfully used to explore various emerging physical phenomena. In this work, the electronic structure and topological properties of the bulk structured antiferromagnetic (AFM) topological insulator (TI) MnSb4Se7 under spin–orbit coupling (SOC) are investigated based on the first-principle calculations. Our results show that the AFM MnSb4Se7 is a non-trivial TI. And applying strain to the AFM MnSb4Se7 can close the band gap. Furthermore, with increasing tensile and compressive strains, AFM MnSb4Se7 undergoes a topological phase transition from a non-trivial TI to a trivial insulator. With increasing strain further, the system undergoes an insulator-metal phase transition. These results suggest that the AFM MnSb4Se7 material has tunable topological properties and is a candidate for exploring interesting topological quantum states and that our work also provides effective help for experimental modulation.