Bistability and nonequilibrium transitions in the system of cavity polaritons under nanosecond-long resonant excitation

Article

关键词: SEMICONDUCTOR MICROCAVITY;    SCATTERING;   

DOI  :  10.1103/PhysRevB.85.075319

来源: SCIE

【 摘 要 】

The polarization dependence of nonequilibrium transitions in a multistable cavity-polariton system is studied under nanosecond-long resonant optical excitation at normal and magic angle incidences with various polarizations of the pump beam. The temporal correlations between the frequency, intensity, and optical polarization of the intracavity field, which all undergo sharp threshold-like changes due to the spin-dependent interaction of cavity polaritons, are visualized. The observed dynamics cannot be reproduced within the conventional semiclassical model based on the Gross-Pitaevskii equations. To explain the observed phenomena, it is necessary to take into account the unpolarized exciton reservoir that brings on an additional blue shift of bright excitons, the same for the sigma(+) and sigma(-) polarization components. This model explains the effect of polarization instability under both pulsed-and continuous-wave resonant excitation conditions, consistently with the spin ring pattern formation that has recently been observed under Gaussian-shaped excitation.

【 授权许可】

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