Bismuth compounds Charge transfer Digital storage Electric control Ferroelectric materials Ferroelectricity Ferroelectrics materials Indium compounds Magnetoelectric couplings Manganese compounds MnBi2Te4 Non-volatile memory Nonvolatile Polarization Quantum theory Selenium compounds Tellurium compounds Thin-films Topological phase Topological phase transition Topological properties Topology Two-dimensional heterostructure magnetoelectric coupling non-volatile memory topological phase transition