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首页> 外文期刊>Physical review >Stimulated parametric polariton-polariton scattering in GaAs microcavities with a shallow polariton band under resonant excitation of exciton mode
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Stimulated parametric polariton-polariton scattering in GaAs microcavities with a shallow polariton band under resonant excitation of exciton mode

机译：激子共振激发下浅极化带GaAs微腔中的受激参量极化子-极化子散射

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Energy and spin relaxation of exciton-polaritons and their condensation in momentum (k) space have been investigated in planar GaAs microcavities with a shallow (~3 meV) low polariton (LP) branch under quasiresonant optical pumping slightly above the exciton energy with ns-long pulses at large k using the time-resolved technique. Nearly 80% depolarization of circularly (σ) polarized photoexcited LPs and the complete depolarization of the linearly (π) polarized LPs are observed during their energy relaxation into the intermediate range of k ~ 1.5 μm~-1. In spite of that fact the macro-occupied state formed at k = 0 is found to be highly polarized, the degree of its circular polarization under σ -polarized excitation reached 0.9, whereas a linear polarization of the condensate formed under the π-polarized excitation is rotated by 90° with respect to that of the pump. The macrooccupation of the LP state at zero k is reaches at the very beginning of the pulse, but turns out to be unstable, decaying in less than 100 ps. The above features indicate that the population of the condensed mode is mainly provided by stimulated parametric LP-LP scattering directly in the driven mode rather than by quasi-equilibrium Bose-Einstein condensation.
机译：在准共振光泵浦下，在稍高于ns-使用时间分辨技术在大k处获得长脉冲。在它们的能量弛豫到k〜1.5μm〜-1的中间范围内时，观察到圆（σ）极化的光激发LP的近80％的去极化和线性（π）极化的LP的完全去极化。尽管事实发现在k = 0处形成的宏观占据状态是高度极化的，但在σ极化激发下其圆极化度达到0.9，而在π极化激发下形成的凝析液呈线性极化。相对于泵旋转了90°。 LP状态在零k处的宏占据是在脉冲的最开始处达到的，但事实证明是不稳定的，衰减小于100 ps。上述特征表明，浓缩模式的填充主要由直接在驱动模式下的受激参量LP-LP散射提供，而不是由准平衡玻色-爱因斯坦凝聚提供。

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