Designing quantum states in two-dimensional systems by reconfiguring local magnetic proximity fields

We theoretically investigate the effects of local, magnetic proximity fields generated by arrays of magnetic nanopillars (MNs) next to two-dimensional (2D) systems such as semiconductor quantum wells and 2D van der Waals crystals. The magnetic landscape generated by the MNs can be reconfigured on the nanometer scale by electrically switching the magnetic state of individual nanopillars. The interaction of carriers’ spin with the magnetic proximity field leads to sizable changes in the local density of states and transport properties of the adjacent 2D system. Furthermore, the local magnetic proximity fields can also induce the formation of new quantum states in the 2D system, enabling the magnetic control and manipulation of quantum states. The versatile functionalities of the proposed system could be used for designing novel quantum and spintronic devices.