1] Institute for Chemical Physical Processes, CNR (CNR-IPCF), UOS Roma Kerberos, Dept. of Physics, La Sapienza University, Piazzale Aldo Moro 5, I-00185 Rome, Italy [2] Department of Physics, La Sapienza University, Piazzale Aldo Moro 5, I-00185 Rome, Italy [3] Institute for Complex Systems, CNR (CNR-ISC), Via dei Taurini 19, I-00185 Rome, Italy.
1] Department of Physics, La Sapienza University, Piazzale Aldo Moro 5, I-00185 Rome, Italy [2] National Nanotechnology Laboratory of CNR-Nanoscience Institute (NNL, CNR-NANO), Via Arnesano, I-73100 Lecce, Italy.
Nat Commun. 2015 Jan 14;6:6058. doi: 10.1038/ncomms7058.
Spin-glass theory is one of the leading paradigms of complex physics and describes condensed matter, neural networks and biological systems, ultracold atoms, random photonics and many other research fields. According to this theory, identical systems under identical conditions may reach different states. This effect is known as replica symmetry breaking and is revealed by the shape of the probability distribution function of an order parameter named the Parisi overlap. However, a direct experimental evidence in any field of research is still missing. Here we investigate pulse-to-pulse fluctuations in random lasers, we introduce and measure the analogue of the Parisi overlap in independent experimental realizations of the same disordered sample, and we find that the distribution function yields evidence of a transition to a glassy light phase compatible with a replica symmetry breaking.
自旋玻璃理论是复杂物理的主要范例之一，描述了凝聚态物质、神经网络和生物系统、超冷原子、随机光子学和许多其他研究领域。根据这一理论，相同条件下的相同系统可能会达到不同的状态。这种效应被称为复制对称性破缺，由名为帕里西重叠的序参量的概率分布函数的形状揭示。然而，在任何研究领域都仍然缺乏直接的实验证据。在这里，我们研究了随机激光的脉冲到脉冲的波动，我们在同一无序样本的独立实验实现中引入并测量了帕里西重叠的模拟，我们发现分布函数提供了证据表明向玻璃状光相转变，与复制对称性破缺一致。
