Topological phase control using Spin-orbit torque

In modern spintronics, the efficient control of magnetism and magnetic dynamics via electric fields has emerged as a key focus due to its promising applications. Using first-principles calculations, we investigated the control of topological phases through intrinsic spin-orbit torques (SOT) in the intrinsic antiferromagnetic topological insulator MnBi2Te4. In the bilayer MnBi2Te4, the spin-orbit torque arises from a locally broken inversion symmetry. Notably, we observed a non-vanishing quantized (constant) even torque within the gap, which originates from inter-band contribution and momentum space topology. The topological nature is characterized by a layer-resolved Chern number. Furthermore, we discovered that magnetization dynamics, driven by spin-orbit torque, also induce topological phase transitions. This reveals a novel approach for manipulating and controlling topological phases in magnetic materials