An in-plane electric field couples the s- and p-wave excitons of biased bilayer graphene, and the resulting level repulsion can drive the lower exciton branch below zero energy, producing an exciton condensate.
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Exciton condensation from level repulsion: application to bilayer graphene
An in-plane electric field couples the s- and p-wave excitons of biased bilayer graphene, and the resulting level repulsion can drive the lower exciton branch below zero energy, producing an exciton condensate.