Novel states of charge-imbalanced polariton condensates

Polariton condensation is a well-established phenomenon featuring all the signatures of an ordinary condensate. However, in the context of polariton condensation, almost exclusively balanced systems, with equal densities of electrons and holes, have been studied. This misses a whole class of potential exotic imbalanced condensed states like an FFLO or a breached-pair state.

Inspired by pioneering works on imbalanced electron-hole systems in TMDC monolayers strongly coupled to a cavity photon, using variational mean-field theory, we explore whether a combination of strong matter-light coupling and electric field biasing promotes novel condensed states, which do not exist otherwise.

On top of a balanced polariton and a dark imbalanced FFLO condensates, we find novel imbalanced polaritonic states with coexisting polariton condensate and unpaired electrons with either isotropic or anisotropic Fermi surface depending on applied bias voltage. These states arise due to combination of strong matter-light coupling and long-range Coulomb potential.