Tunable topological states in antiferromagnetic MnSb4Se7 material

Abstract Magnetic topological insulators (MTIs) of the MnBi 2x Te 3 x +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) MnSb 4 Se 7 under spin–orbit coupling (SOC) are investigated based on the first-principle calculations. Our results show that the AFM MnSb 4 Se 7 is a non-trivial TI. And applying strain to the AFM MnSb 4 Se 7 can close the band gap. Furthermore, with increasing tensile and compressive strains, AFM MnSb 4 Se 7 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 MnSb 4 Se 7 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.