Strong electromagnetic coupling in dimers of topological-insulator nanoparticles and quantum emitters

In this work, we theoretically investigate the optical properties of a topological-insulator nanoparticle--quantum emitter dimer interacting in the strong-coupling regime. The calculations are based on a recently developed semianalytical technique based on a multiple-scattering polaritonic-operator formalism in conjunction with an electromagnetic coupled dipole method. We calculate the light spectrum of the above dimer and report the emergence of a mode that stems from the coupling of the surface topological particle polariton of the topological insulator with the resonance state of the quantum emitter.