  Ferroelectricity, anti-ferromagnetism (AFM) and quantum anomalous Hall effect
(QAHE) are three fundamental phenomena in the field of condensed matter
physics, which could enable the realization of novel devices and thus attracts
great attention. Here, we show theoretical evidence that twodimensional (2D)
even-layer MnBi2Te4 allows for the simultaneous presence of intercorrelated
ferroelectricity, AFM, and QAHE. Importantly, through rational van der Waals
sliding, these exotic properties are strongly coupled. Such coupling could
demonstrate many distinctive physics, for example, ferroelectric control of
itinerant AFM phase and the sign of quantized anomalous Hall plateau.The
explored phenomena and mechanism would not only enrich the research in 2D
ferroelectricity and topological magnets, but also guide the design of
low-consumption high-speed quantum devices.
