Trion and exciton superfluidity induced by the electron Fermi Sea

The research of quantum many-body physics has always been regarded as an important goal of semiconductor strongly coupled microcavity systems. Here, we investigate the interaction mechanism between excitons and electrons in the Fermi Sea. In this case, the exciton-electron interaction can support a new bound state, i.e., trion, and the polariton is dressed by the polarization wave of the electron Fermi Sea, forming an exciton-polaron polariton (polaron-polariton). Meanwhile, the exciton-electron interaction renormalizes the energy and mass of the polariton and reduces the conditions for Bose-Einstein Condensation (BEC) and Kosterlitz-Thouless (KT) transition temperature occurrence. And the superfluid temperature always increases with the exciton-exciton scattering length. In addition, the spectral function, effective mass, scattering rate, KT transition temperature, response function, and conductivity of the polaron-polariton have been calculated in detail by using the Green's function. Our results provide a promising outlook for study the quantum many-body physics and strongly coupled Bose systems.