不同于传统的厄米系统, 非厄米系统存在奇异点。当某一参数演化到奇异点时, 非厄米系统发生相变,即两个本征态合并成一个。利用耦......

We show that inhomogeneous waveguides of slowly varied parity-time[PT]symmetry support localized optical resonances.The ......