The negative Bogoliubov dispersion in exciton-polariton condensates
arXiv:1112.4116 · doi:10.1103/PhysRevB.85.075130
Abstract
Bogoliubov's theory states that self-interaction effects in Bose-Einstein condensates produce a characteristic linear dispersion at low momenta. One of the curious features of Bogoliubov's theory is that the new quasiparticles in the system are linear combinations of creation and destruction operators of the bosons. In exciton-polariton condensates, this gives the possibility of directly observing the negative branch of the Bogoliubov dispersion in the photoluminescence (PL) emission. Here we theoretically examine the PL spectra of exciton-polariton condensates taking into account of reservoir effects. At sufficiently high excitation densities, the negative dispersion becomes visible. We also discuss the possibility for relaxation oscillations to occur under conditions of strong reservoir coupling. This is found to give a secondary mechanism for making the negative branch visible.
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Cited by in corpus (24)
- Quantum fluids of light
- Exciton-polariton condensates
- Dynamics and stability of dark solitons in exciton-polariton condensates
- Observation of quantum depletion in a nonequilibrium exciton-polariton condensate
- A quantum Langevin model for non-equilibrium condensation
- Effective interaction and condensation of dipolaritons in coupled quantum wells
- Interaction induced bi-skin effect in an exciton-polariton system
- Ghost Branch Photoluminescence From a Polariton Fluid Under Nonresonant Excitation
- Low-energy collective oscillations and Bogoliubov sound in an exciton-polariton condensate
- Dynamical instability of a driven-dissipative electron-hole condensate in the BCS-BEC-crossover region
- Highly excited exciton-polariton condensates
- Photoluminescence and gain/absorption spectra of a driven-dissipative electron-hole-photon condensate
- Directional Goldstone waves in polariton condensates close to equilibrium
- Pump-and-probe optical transmission phase shift as a quantitative probe of the Bogoliubov dispersion relation in a nonlinear channel waveguide
- Bogoliubov excitations of a polariton condensate in dynamical equilibrium with an incoherent reservoir
- Spinor polariton condensates under nonresonant pumping: Steady states and elementary excitations
- Unconditional generation of bright coherent non-Gaussian light from exciton-polariton condensates
- Direct observation of the quantum-fluctuation driven amplitude mode in a microcavity polariton condensate
- Finite-temperature Hatree-Fock-Bogoliubov theory for exciton-polaritons
- Controllable Bistability and Squeezing of Confined Polariton Dark Solitons
- Interaction between an impurity and nonlinear excitations in a polariton condensate
- Drag force of a exciton-polariton condensate under non-resonant pumping
- Dynamical instability of a non-equilibrium exciton-polariton condensate
- Dark and thermal reservoir contributions to polariton sound velocity