Opt Lett. 2019 Mar 1;44(5):1190-1193. doi: 10.1364/OL.44.001190.
The delocalization transition in the Anderson model in the presence of an imaginary gauge field is a landmark example of non-Hermitian topological phase transition. Originally proposed by Hatano and Nelson, its topological nature has been disclosed only very recently. Here it shown that a non-Hermitian phase transition can be observed in the frequency domain of an actively mode-locked laser in a parity-time (PT)-symmetric configuration with incommensurate spacing of cavity axial frequencies.
安德森模型中存在虚规范场时的非局域化转变是一个非厄米拓扑相变的标志性范例。该模型最初由 Hatano 和 Nelson 提出，其拓扑性质直到最近才被揭示出来。在这里，我们表明在腔轴频率的非简并间距的奇偶时间（PT）对称配置中，主动锁模激光器的频率域中可以观察到非厄米相变。
