发表机构
Matana University; Airlangga University; National Research and Innovation Agency (BRIN)（马塔纳大学; 艾尔朗加大学; 国家研究与创新署）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
提出纯光学Floquet框架，通过多光束干涉在狄拉克材料中动态生成莫尔类超晶格和准晶势，实现谷选择性能带重构与拓扑相变，并利用表面等离激元克服衍射极限，建立无机械扭转的可重构全光学能带工程平台。
AI 中文摘要
我们提出了一种纯光学Floquet框架，用于在带隙狄拉克材料中动态生成莫尔类超晶格和准晶势，完全无需物理扭转。三束相干圆偏振光束的干涉产生三角形状的、依赖于谷的Floquet质量景观，将狄拉克谱折叠成迷你布里渊区，驱动显著的谷选择性迷你能带重构。我们进一步表明，费米能级附近的能带经历光驱动的拓扑相变。值得注意的是，干涉五束或七束光束会产生非晶体学空间图案，产生具有类似谷对比特征的光学准晶。尽管这种纯光学方法为能带工程提供了通用途径，但达到深亚波长调制需要克服自由空间衍射极限。为克服此限制，我们考虑高度受限的、具有受控相对相位的线偏振表面等离激元极化子场。其相位控制的干涉产生空间交替的手性质量，空间平均为零。因此，两个谷表现出简并能谱，同时承载相反的谷分辨迷你能带陈数。我们的发现建立了一个可重构的全光学平台，用于动态工程莫尔类能带、准晶电子态和谷依赖拓扑，无需机械扭转。
英文摘要
We propose a purely optical Floquet framework to dynamically generate moiré-like superlattices and quasicrystalline potentials in a gapped Dirac material, entirely bypassing the need for physical twisting. The interference of three coherent circularly polarized beams produces a triangular, valley-dependent Floquet mass landscape that folds the Dirac spectrum into a mini-Brillouin zone, driving pronounced valley-selective miniband reconstruction. We further show that the bands near the Fermi level undergo a light-driven topological phase transition. Remarkably, interfering five or seven beams yields non-crystallographic spatial patterns, giving rise to optical quasicrystals with similar valley contrasting features. Although this purely optical approach provides a versatile route to band engineering, reaching deep subwavelength modulation requires overcoming the free-space diffraction limit. To overcome this limitation, we consider highly confined, linearly polarized surface plasmon polariton fields with controlled relative phases. Their phase-controlled interference generates a spatially alternating chiral mass with zero spatial average. Consequently, the two valleys exhibit degenerate energy spectra while hosting opposite valley-resolved miniband Chern numbers. Our findings establish a reconfigurable, all-optical platform for dynamically engineering moiré-like bands, quasicrystalline electronic states, and valley-dependent topology without mechanical twisting.
Comments10 pages, 7 figures
