Effect of optically-induced potential on the energy of trapped exciton-polaritons below the condensation threshold
arXiv:1808.00749 · doi:10.1103/PhysRevB.100.085301
Abstract
Exciton-polaritons (polaritons herein) offer a unique nonlinear platform for studies of collective macroscopic quantum phenomena in a solid state system. Shaping of polariton flow and polariton confinement via potential landscapes created by nonresonant optical pumping has gained considerable attention due to the degree of flexibility and control offered by optically-induced potentials. Recently, large density-dependent energy shifts (blueshifts) exhibited by optically trapped polaritons at low densities, below the bosonic condensation threshold, were interpreted as an evidence of strong polariton-polariton interactions [Nat. Phys. 13, 870 (2017)]. In this work, we further investigate the origins of these blueshifts in optically-induced circular traps and present evidence of significant blueshift of the polariton energy due to reshaping of the optically-induced potential with laser pump power. Our work demonstrates strong influence of the effective potential formed by an optically-injected excitonic reservoir on the energy blueshifts observed below and up to the polariton condensation threshold and suggests that the observed blueshifts arise due to interaction of polaritons with the excitonic reservoir, rather than due to polariton-polariton interaction.
arXiv comment10 pages, 8 figures
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- Dispersion relation of the collective excitations in a resonantly driven polariton fluid
- Low-energy collective oscillations and Bogoliubov sound in an exciton-polariton condensate
- Enhancing ground state population and macroscopic coherence of room-temperature WS polaritons through engineered confinement
- Bogoliubov excitations of a polariton condensate in dynamical equilibrium with an incoherent reservoir
- Crossover from exciton-polariton condensation to photon lasing in an optical trap
- Self-Induced Valley Bosonic Stimulation of Exciton-Polaritons in a Monolayer Semiconductor
- Narrow-linewidth exciton-polariton laser
- Cavity Optomechanics with a Laser Engineered Optical Trap
- Coherence of a non-equilibrium polariton condensate across the interaction-mediated phase transition
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- Collective excitations of exciton-polariton condensates in a synthetic gauge field