Abstract

Nonequilibrium transitions in the cavity polariton system are investigated under nanosecond-long pulsed excitation with linearly polarized light (TE or TM modes) near the magic angle. The main objective is to clarify the influence of the polarization-dependent properties of the polariton-polariton interaction on (i) instabilities in a driven lower polariton mode and (ii) the temporal hysteresis effects in the kinetics of the scattered polariton population. The driven mode retains the polarization of the exciting pulse and exhibits instabilities typical of the scalar (``spinless'') polariton system excited with circularly polarized light. No increase in the instability threshold for the driven mode and, as a consequence, no polarization multistability discussed for the spinor polariton system [N. A. Gippius et al., Phys. Rev. Lett. 98, 236401 (2007)] is observed. Polarization of the scattering signal at the zero wave vector and that of the driven mode are mutually perpendicular, due to the polarization dependence of the exciton-exciton interaction. At the same time, at pump intensities well above the threshold of stimulated scattering, the signal exhibits a markable decrease (up to 25%) of the polarization degree during the pulse transmission.

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