微腔极化激元凝聚体的相干特性
Coherence properties of the microcavity polariton condensate
摘要：
本文提出了一个理论模型，解释了微腔极化激元凝聚体中占主导地位的退相干过程。被调用的机制是自相位调制的效果，从而相互作用转换成随机的能量变化的极化激元数波动。该模型表明，相位相干衰减，g1（t），具有Kubo形式，它可以是高斯或指数，这取决于数量波动是慢还是快。该波动率还确定强度关联函数的衰减时间g2（t），因此其可以通过实验直接确定。该模型解释了最近对g1（t）相对快速的高斯衰减的实验测量，但也预测了一个机制，进一步高于阈值，其中衰减要慢得多。
英文摘要：
A theoretical model is presented which explains the dominant decoherence process in a microcavity polariton condensate. The mechanism which is invoked is the effect of self-phase modulation, whereby interactions transform polariton number fluctuations into random energy variations. The model shows that the phase coherence decay, g1(t), has a Kubo form, which can be Gaussian or exponential, depending on whether the number fluctuations are slow or fast. This fluctuation rate also determines the decay time of the intensity correlation function, g2(t), so it can be directly determined experimentally. The model explains recent experimental measurements of a relatively fast Gaussian decay for g1(t), but also predicts a regime, further above threshold, where the decay is much slower.
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