Topological optical isolator based on polariton graphene

We propose a scheme of a topological optical isolator based on the quantum anomalous Hall effect with strongly coupled exciton-polaritons in a patterned GaAs cavity. We study the practical properties of such a device and optimize its parameters. We obtain an isolation ratio of 49 dB at a wavelength of 783nm for a device of 40 mu m with a maximal signal modulation frequency of 300GHz, operating at temperatures up to 50K. Published by AIP Publishing.