极化激元拓扑绝缘体中的调制不稳定性和孤波
Modulational instability and solitary waves in polariton topological insulators
摘要：
支持激子-极化激元准粒子的光学微腔为研究快速发展的拓扑光子学，特别是光子拓扑绝缘体提供了最有力的平台之一。微腔极化激元石墨烯的能带很容易被磁场控制，并受到自旋轨道耦合效应的影响，这一组合导致最近预测的极化激元拓扑绝缘体中线性单向边缘态的形成。在这项工作中，我们从非相互作用极化激元的线性极限出发，预测非线性拓扑边缘状态的不稳定性，从而形成局域拓扑准孤子，这是非常强大的，免疫沿石墨烯晶格边缘传播的后向散射波包。我们的研究结果为非线性极化激元拓扑绝缘体的实验研究提供了背景，并可能影响光子学和凝聚态物理的其他子领域，其中非线性和自旋轨道效应通常是重要的，并用于应用。
英文摘要：
Optical microcavities supporting exciton-polariton quasi-particles offer one of the most powerful platforms for investigation of rapidly developing area of topological photonics in general, and of photonic topological insulators in particular. Energy bands of the microcavity polariton graphene are readily controlled by magnetic field and influenced by the spin-orbit coupling effects, a combination leading to formation of linear unidirectional edge states in polariton topological insulators as predicted very recently. In this work we depart from the linear limit of non-interacting polaritons and predict instabilities of the nonlinear topological edge states resulting in formation of the localized topological quasi-solitons, which are exceptionally robust and immune to backscattering wavepackets propagating along the graphene lattice edge. Our results provide a background for experimental studies of nonlinear polariton topological insulators and can influence other subareas of photonics and condensed matter physics, where nonlinearities and spin-orbit effects are often important and utilized for applications.
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