论文标题
光子Su-Schrieffer-Heeger（SSH）变体中的拓扑谷晶体
Topological valley crystals in a photonic Su-Schrieffer-Heeger (SSH) variant
论文作者
论文摘要
二维材料的进展表明，作为六角形第一布里渊区的能量极值，山谷为信息操纵提供了新的自由度。然后，相应地设置了支持在边界上支撑此偏好边缘状态的山谷大厅拓扑绝缘子。在本文中，在单位细胞中的六个可调介电三角形柱组成的二维光子晶体是在变形的Su-Schrieffer-Heeger（SSH）模型的光子含义中提出的。我们揭示了山谷国家的涡旋性质，并为山谷两极国家建立了选择规则。基于山谷拓扑结构，菱形梁分离器波导旨在验证上面的山谷血压选择。我们的数值结果需要，这种受拓扑保护的边缘状态仍在尖锐的角保持稳健的变速箱，此后为THZ制度中的Valley Photonic设备提供了可行的想法。
Progress on two-dimensional materials has shown that valleys, as energy extrema in a hexagonal first Brillouin zone, provides a new degree of freedom for information manipulation. Then valley Hall topological insulators supporting such-polarized edge states on boundaries were set up accordingly. In this paper, a two-dimensional valley photonic crystal composed of six tunable dielectric triangular pillars in unit cells is proposed in the photonic sense of a deformed Su-Schrieffer-Heeger (SSH) model. We reveal the vortex nature of valley states and establish the selection rules for valley polarized states. Based on the valley topology, a rhombus-shaped beam splitter waveguide is designed to verify the valley-chirality selection above. Our numerical results entail that this topologically protected edge states still maintain robust transmission at sharp corners, henceforth providing a feasible idea for valley photonic devices in THz regime.
