From magnetically doped to intrinsic magnetic topological insulators——a road towards the high temperature quantum anomalous Hall effect

Among the existing topological quantum effects, the quantum anomalous Hall effect is arguably the most promising one for wide practical applications, but the main challenge is the ultra-low temperature required. In this article we describe the mechanism of the quantum anomalous Hall effect in magnetic topological insulators and the key factors that determine its occurring temperature. Recent efforts over the past years to elevate this temperature is reviewed, particularly the latest studies on the intrinsic magnetic topological insulator MnBi₂Te₄. Based on this, we present a roadmap on how to further raise the temperature of the effect in magnetic topological insulator-based systems.