Keldysh field theory of dynamical exciton condensation transitions in nonequilibrium electron-hole bilayers

Abstract

Recent experiments have realized steady-state electrical injection of interlayer excitons in electron-hole bilayers subject to a large bias voltage. In the ideal case in which interlayer tunneling is negligibly weak, the system is in quasi-equilibrium with a reduced effective band gap. Interlayer tunneling introduces a current and drives the system out of equilibrium. In this work we derive a nonequilibrium field theory description of interlayer excitons in biased electron-hole bilayers. In the large bias limit, we find that p-wave interlayer tunneling reduces the effective band gap and increases the effective temperature for intervalley excitons. We discuss possible experimental implications for InAs/GaSb quantum wells and transition metal dichalcogenide bilayers.

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• A New Era of Excitonic Insulators
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• Quantum-geometric dipole: a topological boost to flavor ferromagnetism in flat bands
• Longitudinal Josephson effect in systems with pairing of spatially separated electrons and holes
• Ab initio Approach to Collective Excitations in Excitonic Insulators