Exchange-Driven Chern States in High-Mobility Intrinsic Magnetic Topological Insulators

Layer-Dependent Quantum Anomalous Hall and Quantum Spin Hall Effects in Two-Dimensional LiFeTe

“…Interlayer magnetic coupling is vital to determining the basic properties of van der Waals magnets. − Therefore, the magnetic coupling and MAE of LiFeTe with different thicknesses are further studied. As shown in the top panel of Figure d, for 2 ML LiFeTe with even-layer thickness, the calculated Δ E is −3.46 meV/(Fe pair), indicating an interlayer c-AFM (shown in Figure a).…”

“…Since the discovery of intrinsic QAH insulator MnBi 2 Te 4 , , the layer-dependent QAH effect has been widely studied in magnetic materials. The density functional theory and Monte Carlo calculations indicate that monolayer MnBi 2 Te 4 is a topological trivial FM insulator; even layers of MnBi 2 Te 4 show a zero plateau QAH state, and odd layers exceeding monolayer MnBi 2 Te 4 behave as a topological nontrivial insulator. − In addition, the even layers of MnBi 2 Te 4 are demonstrated as an AFM topological insulator with the topological axion states on the surface, resulting in a quantized magnetoelectric effects. , The robust QAH states are found in monolayer and few-layer TiTe, and the Chern number C enlarges with the increase of layers . However, to date, there is no report about the layer-dependent QSH effect in topological materials.…”