Spin-Selective Currents of Tamm Polaritons

We propose an approach for the excitation of polariton Tamm states with a controllable nontrivial topology. The polaritons emerge at interface two binary one-dimensional photonic crystals belonging to ${C}_{3v}$ point group, exciton resonance within their matching band gaps. external magnetic field applied in Faraday geometry endows dispersion nonreciprocity: it lifts degeneracy between opposite propagation directions plane. phenomenology currents closely resembles one ${Z}_{2}$ topological insulator. proposed structure acts as optical spin splitter controlled by magnitude.