Ground-state and spectral signatures of cavity exciton-polariton condensates

Abstract

We propose a projector-based renormalization framework to study exciton-polariton Bose-Einstein condensation in a microcavity matter-light system. Treating Coulomb interaction and electron-hole/photon coupling effects on an equal footing we analyze the ground-state properties of the exciton polariton model according to the detuning and the excitation density. We demonstrate that the condensate by its nature shows a crossover from an excitonic insulator (of Bose-Einstein respectively BCS type) to a polariton and finally photonic condensed state as the excitation density increases at large detuning. If the detuning is weak polariton or photonic phases dominate. While in both cases a notable renormalization of the quasiparticle band structure occurs that strongly affects the coherent part of the excitonic luminescence, the incoherent wavevector-resolved luminescence spectrum develops a flat bottom only for small detuning.

18 pages, 17 figures, final version

References in corpus (8)

• Exciton-polariton condensates
• Non-equilibrium quantum condensation in an incoherently pumped dissipative system
• On the possibility of an excitonic insulator at the semiconductor-semimetal transition
• BCS-BEC crossover in a system of microcavity polaritons
• Models of coherent exciton condensation
• Electron-hole pair condensation at the semimetal-semiconductor transition: a BCS-BEC crossover scenario
• Condensation of Excitons in Cu2O at Ultracold Temperatures: Experiment and Theory
• A quantum Langevin model for non-equilibrium condensation

Cited by in corpus (4)

• Projector-based renormalization approach to electron-hole-photon systems in nonequlibrium steady-state
• Phase diagram of microcavity exciton-polariton condensates
• Quantum coherent states of mass-imbalanced electron-hole system within optical microcavities
• BCS-BEC crossover of polaritonic condensates in mass-imbalanced semimetal/semiconductor microcavities