  In this letter, we propose a mechanism to control the magnetic properties of
topological quantum material (TQM) by using magnetoelectric coupling: this
mechanism uses a heterostructure of TQM with two-dimensional (2D) ferroelectric
material, which can dynamically control the magnetic order by changing the
polarization of the ferroelectric material and induce possible topological
phase transitions. This concept is demonstrated using the example of the
bilayer MnBi2Te4 on ferroelectric In2Se3 or In2Te3, where the polarization
direction of the 2D ferroelectrics determines the interfacial band alignment
and consequently the direction of the charge transfer. This charge transfer, in
turn, enhances the stability of the ferromagnetic state of MnBi2Te4 and leads
to a possible topological phase transition between the quantum anomalous Hall
(QAH) effect and the zero plateau QAH. Our work provides a route to dynamically
alter the magnetic ordering of TQMs and could lead to the discovery of new
multifunctional topological heterostructures.
