Spontaneous symmetry breaking in a polariton and photon laser.
Spontaneous symmetry breaking in a polariton and photon laser.
复制标题
极化子和光子激光器中的自发对称性破缺。
DOI：
10.1103/physrevlett.109.016404
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发表时间：
2012
影响因子：
8.6
通讯作者：
P. Lagoudakis
中科院分区：
文献类型：
--
作者：
H. Ohadi;E. Kammann;T. Liew;K. Lagoudakis;Alexey Kavokin;P. Lagoudakis
本文报道了半导体微腔中强耦合和弱耦合下自发对称破缺和远程空间相干的同时观测。在脉冲激励下，在极化激子和光子激射中观察到随机序参量的形成。发射的斯托克斯矢量的单次测量显示了随机极化的形成。在阈值以下，极化噪声不超过10%，而在阈值以上，我们观察到每个激发脉冲后的总极化高达50%，而脉冲集合上的平均极化几乎为零。在极化子和光子激光中，随机极化的形成都伴随着空间相干性的形成。我们发现在极化激子和光子激射中，玻色-爱因斯坦凝聚的自发对称性破缺的Landau判据和远距离阶的Penrose-Onsager判据都满足。
We report on the simultaneous observation of spontaneous symmetry breaking and long-range spatial coherence both in the strong- and the weak-coupling regime in a semiconductor microcavity. Under pulsed excitation, the formation of a stochastic order parameter is observed in polariton and photon lasing regimes. Single-shot measurements of the Stokes vector of the emission exhibit the buildup of stochastic polarization. Below threshold, the polarization noise does not exceed 10%, while above threshold we observe a total polarization of up to 50% after each excitation pulse, while the polarization averaged over the ensemble of pulses remains nearly zero. In both polariton and photon lasing regimes, the stochastic polarization buildup is accompanied by the buildup of spatial coherence. We find that the Landau criterion of spontaneous symmetry breaking and Penrose-Onsager criterion of long-range order for Bose-Einstein condensation are met in both polariton and photon lasing regimes.