发表机构
University of Antwerp（安特卫普大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究利用携带轨道角动量（OAM）的结构化光，通过圆偏振拉盖尔-高斯光束在超薄拓扑绝缘体薄膜中构建实空间弗洛凯拓扑，揭示了光子OAM作为非平衡拓扑控制参数的作用，为量子材料可编程拓扑景观提供了新途径。
AI 中文摘要
弗洛凯工程通常将光视为改变整个受驱动材料拓扑结构的均匀控制场。本文展示，携带轨道角动量（OAM）的结构化光可实现不同的 regime（ regime 译为“ regime”，保留原词），其中拓扑结构直接写入实空间。对于超薄拓扑绝缘体薄膜，圆偏振拉盖尔-高斯光束会产生径向弗洛凯质量，其符号变化定义了一个由两个同心手性环模式界定的拓扑环。该跃迁具有螺旋度选择性：在与厚度相关的临界频率以下，左旋圆偏振光驱动质量反转，而右旋圆偏振光会增大能隙并使薄膜变为平庸态。独立来看，OAM 量子数可在不改变频率、强度或螺旋度的情况下移动并重塑该环。在解耦表面极限下，同一机制产生纯弗洛凯诱导的拓扑质量和涡旋芯零模。这些结果将光子 OAM 识别为非平衡拓扑的控制参数，并为量子材料中可编程拓扑景观提供了一条途径。
英文摘要
Floquet engineering usually treats light as a uniform control field that changes the topology of an entire driven material. Here we show that structured light carrying orbital angular momentum (OAM) enables a different regime, in which topology is written directly in real space. For ultrathin topological insulator films, circularly polarized Laguerre--Gaussian beams generate a radial Floquet mass whose sign changes define a topological annulus bounded by two concentric chiral ring modes. The transition is helicity selective: below a thickness-dependent critical frequency, left-circularly polarized light drives mass inversion, whereas right-circularly polarized light increases the gap and leaves the film trivial. Independently, the OAM quantum number shifts and reshapes the annulus without changing the frequency, intensity, or helicity. In the decoupled-surfaces limit, the same mechanism produces a purely Floquet-induced topological mass and a vortex-core zero mode. These results identify photon OAM as a control parameter for nonequilibrium topology and provide a route to programmable topological landscapes in quantum materials.
