南京师范大学Ye Xiong团队近日揭示了非厄米格中激发态的空间偏移。这一研究成果发表在2025年5月27日出版的《物理评论A》杂志上。

课题组研究了在高耗散条件下注入非厄米微腔晶格的光波包的行为。虽然晶格的所有本征态都表现出指数衰减，但特定激发态保持相干传播。在一维晶格中，当谱围绕复平面中的有限区域时，这种状态会发生远离注入位置的空间位移，这是具有点间隙的非厄米系统的基本性质。

将这种转变扩展到二维晶格揭示了具有方向可调臂的几何异常v形波包形成。值得注意的是，这种几何控制机制能够实现非埃尔米特光子态的全光转向，而不需要进行结构修改。

附：英文原文

Title: Spatial offset of excited states in non-Hermitian lattices

Author: Xiaohan Jiang, Yuanyuan Pan, Yang Zhang, Ye Xiong

Issue&Volume: 2025/05/27

Abstract: We investigate the behavior of light-wave packets injected into non-Hermitian microcavity lattices under highly dissipative conditions. While all eigenstates of the lattice exhibit exponential decay, a specifically excited state maintains coherent propagation. In a one-dimensional lattice, this state undergoes a spatial displacement shift away from the injection position, which is a fundamental property of non-Hermitian systems with a point gap when the spectrum encircles a finite region in the complex plane. Extending such a shift to two-dimensional lattices reveals a geometrically anomalous -shaped wave-packet formation with orientation-tunable arms. Notably, this geometric control mechanism enables all-optical steering of non-Hermitian photonic states without requiring structural modifications.

DOI: 10.1103/PhysRevA.111.052218

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.111.052218