AI 中文总结
该研究探究非相干泵浦发射体系综中超辐射转变的条件，建立临界标度律，证明超辐射对退相和非辐射衰减的鲁棒性，为相关实验提供基础。
AI 中文摘要
超辐射是发射体与光集体相互作用产生的显著现象，从根本上与发射体偶极矩之间长程关联的出现相关，因此它是耗散多体系统的一个独特相，与独立发射体的情况不同，类似铁磁性在磁性材料中相对于顺磁性的独特性。本研究探讨在存在退相和个体衰减的发射体系综中发生超辐射转变的条件，该情况与固态中的发射体尤为相关。采用排列不变发射体系综的简化假设，可高效求解脉冲激发后的耗散动力学以及非相干泵浦下的稳态。该精确解使我们能对截断累积量展开方法进行基准测试，该方法可对任意大的系统尺寸给出预测。我们证明，超辐射在脉冲激发和连续泵浦下，对相当大的退相和非辐射衰减速率具有根本上的鲁棒性，这种鲁棒性源于超辐射发射相对于个体与局域环境耦合的集体加速效应。我们建立了正常辐射与超辐射之间转变的普适临界标度律，并表明在超辐射相中，达到渐近标度区前可观察到显著的有限尺寸交叉。我们的结果为未来实验提供了基础，可对超辐射的标度性质进行定量表征，将其视为非相干泵浦发射体系综中独特的非平衡多体相。
英文摘要
Super-radiance is a striking phenomenon resulting from the collective interaction of emitters with light, and it is fundamentally related to the appearance of long-range correlations between the dipole moments of the emitters. As such, it represents a distinct phase of dissipative many-body systems compared to the case of independent emitters, similarly to how ferromagnetism stands out in magnetic materials in contrast to paramagnetism. In this work we address the conditions under which the transition to super-radiance can occur in ensembles of emitters subject to dephasing and individual decay -- a situation which is particularly relevant to the case of emitters in the solid state. The simplifying assumption of an ensemble of permutationally invariant emitters allows for the efficient solution of both the dissipative dynamics after a pulsed excitation, as well as of the steady state under incoherent pumping. This exact solution allows us to benchmark a truncated cumulant expansion approach, which can give predictions for arbitrarily big system sizes. We show that super-radiance is fundamentally robust to sizable dephasing and non-radiative decay rates, both under a pulsed excitation, as well as under continuous pumping. This robustness is the result of the collective acceleration effect of super-radiant emission with respect to the individual coupling to a local environment. We establish the universal critical scaling laws at the transition between normal radiance and super-radiance; and we show that, in the super-radiant phase, significant finite-size crossovers can be observed before reaching the asymptotic scaling regime. Our results pave the way for future experiments to provide a quantitative characterization of the scaling properties of super-radiance, seen as a distinct non-equilibrium many-body phase in ensembles of incoherently pumped emitters.
Comments40 pages, 22 figures
