论文标题
在手性耦合量子发射器中的无序辅助激发定位
Disorder-assisted excitation localization in chirally coupled quantum emitters
论文作者
论文摘要
具有手性耦合的一维量子发射器可以表现出非偶然的衰减通道，以及通过原子 - 波导界面介导的光诱导的偶极偶极相互作用。当将位置障碍引入这种原子阵列时，我们能够确定从激发离域到定位的动态相变，与衰减速率的方向性与光诱导的偶极 - 偶极 - 偶极相互作用的强度之间存在相互作用。在本地化阶段，其特征长度降低并饱和，朝相互耦合方向降低，从而导致系统动力学的巨大性被强烈折断。我们还发现了由互动驱动的定位阶段的相互作用的重点行为，并且在强障碍下的水平排斥降低。前者恰逢幂律腐烂的von Neumann熵的指数下降，这为开放量子系统中的纠缠和非平衡动力学之间的密切关系提供了见解，而后者则在这个特定无序的系统中呈现出差异的狭窄分布。
One-dimensional quantum emitters with chiral couplings can exhibit nonreciprocal decay channels, along with light-induced dipole-dipole interactions mediated via an atom-waveguide interface. When the position disorders are introduced to such atomic array, we are able to identify the dynamical phase transition from excitation delocalization to localization, with an interplay between the directionality of decay rates and the strength of light-induced dipole-dipole interactions. Deep in the localization phase, its characteristic length decreases and saturates toward a reciprocal coupling regime, leading to a system dynamics whose ergodicity is strongly broken. We also find an interaction-driven re-entrant behavior of the localization phase and a reduction of level repulsion under strong disorder. The former coincides with a drop in the exponent of power-law decaying von Neumann entropy, which gives insights to a close relation between the preservation of entanglement and nonequilibrium dynamics in open quantum systems, while the latter presents a distinct narrow distribution of gap ratios in this particular disordered system.
