Exciton-Polariton Topological Insulator with an Array of Magnetic Dots

Recently, there have been several proposals on exciton-polariton topological insulators, most of which have required strong external magnetic fields induced by bulky superconducting coils. We propose an alternative design for a polariton topological insulator, where excitons are in the proximity of an additional layer of a ferromagnetic material, with a predefined magnetic moment located between the pillars of the cavity. Our design supports a variety of topological phases and transitions between Chern numbers +/- 2 and +/- 1 by varying either the magnetic moment of the ferromagnetic material or the spin-orbit coupling between different spin projections, thus enabling compact polariton devices harnessing switchable topological edge modes.