May 12, 2023
1 MIN READ
The interplay between topology and magnetism can lead to many exotic states. Recently, MnBi2Te4 (MBT) and MBT/(Bi2Te3)n have attracted attention because of their intrinsic magnetism and topological band structures, but they show an antiferromagnetic (AFM) ground state between different layers, which requires a large magnetic field to align the spin direction, limiting their application. The system proposed in this letter consists of a heterostructure of MBT on a two-dimensional (2D) ferroelectric material, where the interface-charge transfer between the subsystems can be dynamically controlled by changing the polarization of the ferroelectric substrate with an applied electric field. The resulting enhanced stability of the ferromagnetic state of MnBi2Te4 leads to a possible topological phase transition between the quantum anomalous Hall (QAH) effect and the zero plateau QAH, providing a route to dynamically alter the magnetic ordering of TQMs and possibly lead to the discovery of new multifunctional topological heterostructures.
