二维受驱动耗散凝聚体中普适标度律的交叉
Crossing over universal scaling laws in two-dimensional driven dissipative condensates
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中文总结 AI 辅助
本文研究二维受驱动耗散激子极化激元凝聚体，通过调谐微观参数观测到EW与KPZ普适类标度律的交叉，验证了理论预测的临界指数，确立其为研究二维KPZ普适类的理想平台。
中文摘要 AI 辅助
在低维系统中，涨落会增强并阻止连续对称性的自发破缺，因此空间和时间关联函数会在大距离和长时间下衰减。一个公认的例子是平衡态下的二维玻色凝聚体，它不表现出相干性的长程有序，而是呈现属于Berezinski-Kosterlitz-Thouless普适类的代数衰减。相比之下，非平衡玻色凝聚体的普适行为更为多样，仍存在许多未解决的问题。本文中，我们研究半导体光学微腔中二维受驱动耗散激子极化激元凝聚体的时空相干特性。通过调节微观参数，我们观察到两种标度律之间的交叉，将其归因于Edwards-Wilkinson（EW）和Kardar-Parisi-Zhang（KPZ）普适类。我们证明测量得到的一阶关联函数可坍缩到EW和KPZ普适标度函数上，并得到与理论预测值吻合良好的临界指数。我们的结果凸显了激子极化激元凝聚体的本征非平衡特性，并确立其作为研究二维KPZ普适类的理想平台。
英文摘要
In low dimensional systems, fluctuations are enhanced and prevent the spontaneous breaking of continuous symmetries. As a result, spatial and temporal correlation functions decay at large distances and long times. A well established example is given by two-dimensional bosonic condensates at equilibrium, which do not display long-range order of the coherence but algebraic decay belonging to the Berezinski-Kosterlitz-Thouless universality class. In contrast, the universal behaviors of non-equilibrium bosonic condensates are more diverse and many open questions remain. Here, we explore the spatio-temporal coherence properties of two-dimensional driven-dissipative polariton condensates in semiconductor optical microcavities. By tuning microscopic parameters, we observe a cross-over between two scaling laws that we attribute to the Edwards-Wilkinson (EW) and the Kardar-Parisi-Zhang (KPZ) universality classes. We demonstrate the collapse of the measured first-order correlations onto the EW and KPZ universal scaling functions and obtain critical exponents, well matching the values predicted theoretically. Our results highlight the intrinsic non-equilibrium nature of polariton condensates and establish them as a platform of choice for controlled exploration of the two-dimensional KPZ universality class.
