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Coexisting nonequilibrium condensates with long-range spatial coherence in semiconductor microcavities

机译:半导体微腔中具有远距离空间相干性的共存非平衡冷凝物

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摘要

Real- and momentum-space spectrally resolved images of microcavity polariton emission in the regime of condensation are investigated under nonresonant excitation using a laser source with reduced intensity fluctuations on the time scale of the exciton lifetime. We observe that the polariton emission consists of many macroscopically occupied modes. Lower-energy modes are strongly localized by the spatial polaritonic potential disorder on a scale of a few microns. Higher-energy modes have finite k vectors and are delocalized over 10-15 μm. All the modes exhibit long-range spatial coherence comparable to their size. We provide a theoretical model describing the behavior of the system with the results of the simulations in good agreement with the experimental observations. We show that the multimode emission of the polariton condensate is a result of its nonequilibrium character, the interaction with the local polaritonic potential, and the reduced intensity fluctuations of the excitation laser.
机译:在非共振激发下,使用激光源在激子寿命的时间尺度上减小了强度波动,研究了在缩合状态下微腔极化子发射的真实空间和动量空间光谱分辨图像。我们观察到极化子发射由许多宏观占据的模式组成。较低能量的模式在几微米的尺度上被空间极化势势紊乱强烈地局限。高能模式具有有限的k个矢量,并且在10-15μm范围内被离域。所有这些模式都表现出与其大小相当的远程空间连贯性。我们提供了一个描述系统行为的理论模型,其仿真结果与实验观察结果非常吻合。我们表明,极化子冷凝物的多模发射是由于其非平衡特性,与局部极化子电势的相互作用以及激发激光器的强度波动减小所致。

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