Topological properties of layered MnSb<sub>2</sub>Te<sub>4</sub>/Sb<sub>2</sub>Te<sub>3</sub> heterojunctions
Abstract
<p indent="0mm">As a typical topological state, quantum anomalous Hall effect has attracted wide attention. In this paper, the electronic structure and topological properties of MnSb<sub>2</sub>Te<sub>4</sub>/Sb<sub>2</sub>Te<sub>3</sub> van der Waals heterojunction at different interlayer spacing are studied by first-principles calculation. It is found that MnSb<sub>2</sub>Te<sub>4</sub>/Sb<sub>2</sub>Te<sub>3</sub> system behaves as a topologically trivial phase. By adjusting the distance between Te and Sb atomic layer in MnSb<sub>2</sub>Te<sub>4</sub> to <sc>2.3 Å,</sc> band inversion occurs in the system under the action of Spin-orbit coupling, and the transformation from topologically trivial phase to topologically nontrivial phase is realized. The calculation of band structure and topological properties shows that the Chern number of the system is 1, Moreover, there exists a 14.5 meV topological nontrivial band gap, a chiral edge state and quantized Hall conductance, which can realize the quantum anomalous Hall effect of nonzero Chern number in zero field. Our work provides a reference for other magnetic van der Waals systems to realize quantum anomalous Hall effects.</p>
