The role of the stress trap in polariton quasiequilibrium condensation in GaAs microcavities

Abstract

Recent experiments have shown several effects indicative of Bose-Einstein condensation in polaritons in GaAs-based microcavity structures when a harmonic potential trap for the two-dimensional polaritons is created by applied stress. These effects include both real-space and momentum-space narrowing, first-order coherence, and onset of linear polarization above a particle density threshold. Similar effects have been seen in systems without traps, raising the question of how important the role of the trap is in these experiments. In this paper we present results for both trapped conditions and resonant, non-trapped conditions in the same sample. We find that the results are qualitatively different, with two distinct types of transitions. At low density in the trap, the polaritons remain in the strong-coupling regime while going through the threshold for onset of coherence; at higher density, there is a different threshold behavior which occurs with weak coupling and can be identified with lasing; this transition occurs both with and without a trap.

References in corpus (7)

• Quantised Vortices in an Exciton-Polariton Fluid
• Quantum-fluid dynamics of microcavity polaritons
• Spontaneous Polarisation Build up in a Room Temperature Polariton Laser
• Photon lasing in a GaAs microcavity: similarities with a polariton condensate
• Actively Tuned and Spatially Trapped Polaritons
• Theory of Bose-Einstein condensation and superfluidity of two-dimensional polaritons in an in-plane harmonic potential
• Predicting the Ionization Threshold for Carriers in Excited Semiconductors

Cited by in corpus (20)

• Bose-Einstein Condensation of Excitons in Cu${}_2$O: Progress Over Thirty Years
• Non-Hermitian phase transition from a polariton Bose-Einstein condensate to a photon laser
• Critical fluctuations at a many-body exceptional point
• Second Thresholds in BEC-BCS-Laser Crossover of Exciton-Polariton Systems
• Experimental verification of the very strong coupling regime in a GaAs quantum well microcavity
• Coherence and Optical Emission from Bilayer Exciton Condensates
• Drag effects in the system of electrons and microcavity polaritons
• Direct Generation of Radially Polarized Vector Vortex Beam with an Exciton-Polariton Laser
• Giant permanent dipole moment of 2D excitons bound to a single stacking fault
• Photoluminescence and gain/absorption spectra of a driven-dissipative electron-hole-photon condensate
• Generating Functional Approach for Spontaneous Coherence in Semiconductor Electron-Hole-Photon Systems
• Polariton Laser in the Bardeen-Cooper-Schrieffer Regime
• Polariton Condensation and Lasing
• High temperature phase transition in the coupled atom-light system in the presence of optical collisions
• Can we move photons?
• Crossover from exciton-polariton condensation to photon lasing in an optical trap
• Decrease of heavy-hole exciton mass induced by uniaxial stress in GaAs/AlGaAs quantum well
• Ultra-low threshold polariton condensation
• Coherent Flow and Trapping of Polariton Condensates with Long Lifetime
• Crossover from exciton-polariton to photon Bose-Einstein condensation