A BCS wavefunction approach to the BEC-BCS crossover of exciton-polariton condensates
arXiv:1005.3141 · doi:10.1103/PhysRevLett.105.186402
Abstract
The crossover between low and high density regimes of exciton-polariton condensates is examined using a BCS wavefunction approach. Our approach is an extension of the BEC-BCS crossover theory for excitons, but includes a cavity photon field. The approach can describe both the low density limit, where the system can be described as a Bose-Einstein condensate (BEC) of exciton-polaritons, and the high density limit, where the system enters a photon dominated regime. In contrast to the exciton BEC-BCS crossover where the system approaches an electron-hole plasma, the polariton high density limit has strongly correlated electron-hole pairs. At intermediate densities, there is a regime with BCS-like properties, with a peak at non-zero momentum of the singlet pair function. We calculate the expected photoluminescence and give several experimental signatures of the crossover.
10 pages, 3 figures
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Cited by in corpus (21)
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- Photoluminescence of a microcavity quantum dot system in the quantum strong-coupling regime
- Highly excited exciton-polariton condensates
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- Steady-state generation of negative-Wigner-function light using feedback
- Microscopic Theory of Equilibrium Polariton Condensates
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- Phase diagram of microcavity exciton-polariton condensates
- Symmetry breaking and superfluid currents in a split-ring spinor polariton condensate
- Driven Dipolariton Transistors in Y-shaped Channels
- Cooper pair polaritons in cold fermionic atoms within a cavity
- Terahertz Spectroscopy of Semiconductor Microcavity Lasers I: Photon Lasers
- Quasi-equilibrium polariton condensates in the non-linear regime and beyond
- Collective terahertz fluctuation modes in a polariton laser
- Generation of matter threefold star state by dynamical transfer from photonic counterpart
- Uncover quantumness in the crossover from BEC to quantum-correlated phase
- Emergence of a condensate with finite-energy Cooper pairing in hybrid exciton/superconductor systems