Discrete spatial solitons are self-consistent solutions of the discrete nonlinear Schrödinger equation that maintain their shape during propagation. Here we show, using a pump-probe technique, that soliton formation can be used to optically induce and control a linear topological end state in the bulk of a Su–Schrieffer–Heeger lattice, using evanescently-coupled waveguide arrays. Specifically, we observe an abrupt nonlinearly-induced transition above a certain power threshold due to an inversion symmetry-breaking nonlinear bifurcation. Our results demonstrate all-optical active control of topological states.

中文翻译：

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通过在一维晶格中形成孤子对拓扑末端态进行光学控制


离散空间孤子是离散非线性薛定谔方程的自洽解，在传播过程中保持其形状。在这里，我们使用泵浦探测技术展示了孤子的形成可用于使用倏逝耦合波导阵列在 Su-Schrieffer-Heeger 晶格的大部分中光学诱导和控制线性拓扑末端状态。具体来说，我们观察到由于反转对称性破坏非线性分岔，在某个功率阈值以上突然出现非线性诱导的跃迁。我们的结果证明了拓扑状态的全光主动控制。