论文标题
PT对称和非拓扑状态的非线性控制
Nonlinear control of PT-symmetry and non-Hermitian topological states
论文作者
论文摘要
拓扑光子学和非热光学的进步已大大改变了我们对跨学科概念如何赋予前所未有的应用程序的看法。桥接这两个区域可以发现复杂系统中拓扑与非热度之间的互惠。到目前为止，此类努力主要集中在线性访问制度上。在这里，我们建立了一个非线性非热拓扑平台，用于控制平均时间（PT）对称性和拓扑边缘状态。在实验上，我们证明了光学非线性有效地调节了非热su-schrieffer-heeger晶格中拓扑接口波导的增益和损失，从而导致PT和非PPT对称方案之间的切换，并伴随着造成拓扑零模式的破坏和恢复。从理论上讲，我们研究了两种拮抗作用之间相互作用的基本问题：敏感性接近特殊点和非热拓扑模式的鲁棒性。通过局部非线性实现对全球PT对称的单渠道控制，可能会预示着新的可能性，以实现轻度操纵和非常规设备应用的新可能性。
Advances in topological photonics and non-Hermitian optics have drastically changed our perception on how interdisciplinary concepts may empower unprecedented applications. Bridging the two areas could uncover the reciprocity between topology and non-Hermiticity in complex systems. So far, such endeavors have focused mainly on linear-optics regime. Here, we establish a nonlinear non-Hermitian topological platform for control of parity-time (PT) symmetry and topological edge states. Experimentally, we demonstrate that optical nonlinearity effectively modulates the gain and loss of a topological interface waveguide in a non-Hermitian Su-Schrieffer-Heeger lattice, leading to switching between PT and non-PT-symmetric regimes accompanied by destruction and restoration of topological zero modes. Theoretically, we examine the fundamental issue of the interplay between two antagonistic effects: the sensitivity close to exceptional points and the robustness of non-Hermitian topological modes. Realizing single-channel control of global PT-symmetry via local nonlinearity may herald new possibilities for light manipulation and unconventional device applications.
