Bipolariton dispersion laws

Abstract

Bipolariton dispersion laws are derived here using the results obtained by the application of our approach that eliminates the quasiparticle nonconservation from the equivalent hamiltonian which was already tested in previous papers. The fundamental equations determining the bipolariton energies are derived first for the general case and then applied to the case of a chain of molecules. For the exciton-photon resonance region improved results are obtained with respect to earlier ones and in the region far from resonance three different dispersion laws are derived. One of them reduces asymptotically to the biexciton dispersion law cited in our earlier paper but the most interesting one represents the bound state of two polaritons belonging to different branches. © 1976.