论文标题
非线性高阶极化拓扑绝缘子
Nonlinear higher-order polariton topological insulator
论文作者
论文摘要
我们以高阶非线性拓扑绝缘子的形式解决了激子 - 孔子角状态的共鸣响应和双重性，该拓扑座是通过微腔柱的kagome布置实现的。另一方面，由于泵和损耗之间的平衡以及非均匀电势景观中的非线性和分散性之间的平衡，因此存在这种状态，并存在于相应线性局部化模式的特征能量周围的泵能量。非线性角状态在高阶拓扑绝缘子中的定位可以通过调谐泵能量有效控制。我们将角状形成的机理与截短的Kagome阵列的对称性联系起来。角州与密集的边缘状态共处，但能量良好。即使在角落微腔柱中存在扰动的情况下，非线性角状态仍然存在。
We address the resonant response and bistability of the exciton-polariton corner states in a higher-order nonlinear topological insulator realized with kagome arrangement of microcavity pillars. Such states are resonantly excited and exist due to the balance between pump and losses, on the one hand, and between nonlinearity and dispersion in inhomogeneous potential landscape, on the other hand, for pump energy around eigen-energies of corresponding linear localized modes. Localization of the nonlinear corner states in a higher-order topological insulator can be efficiently controlled by tuning pump energy. We link the mechanism of corner state formation with symmetry of the truncated kagome array. Corner states coexist with densely packed edge states, but are well-isolated from them in energy. Nonlinear corner states persist even in the presence of perturbations in corner microcavity pillar.
