Year: 2020
Type: article
Abstract: Significance Topological insulators have Dirac cone surface states protected by time-reversal symmetry (TRS). Weak magnetic order in topological insulator thin films can lead to the quantum anomalous Hall effect (QAHE), which was first realized by magnetic doping of topological insulators to establish a fragile ferromagnetic state. Recent work has established MnBi 2 Te 4 as a structurally ordered magnetic topological insulator. We report on a theoretical study of superlattices formed from M n B i 2 T e 4 and Bi 2 Te 3 building blocks that employs a simplified model validated by ab initio density-functional theory. We use it to shed light on the dependence of the quantum anomalous Hall effect on film thickness, magnetic configuration, the stacking sequences of the van der Waals coupled building blocks, and bulk electronic structure.
Authors: Chao Lei, Shu Chen, Allan H. MacDonald
Institutions: The University of Texas at Austin, Shanghai University
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G4309355647, G6765329077, G843343264
OpenAlex ID: W3046937339