AI 中文总结
本文提出一种可自组装的新型闪锌矿光子晶体，其因缺失空间反演对称性支持光子外尔点与费米弧表面态，经优化后相关特征可实验观测，且该结构可通过分子动力学模拟实现自组装，为大规模拓扑光子晶体制备提供平台。
AI 中文摘要
长期以来，胶体自组装被视为一种制备大规模三维光子晶体的方法，该方法可用于制备可见光和近红外波长范围内具有重要光学特性的光子晶体，而传统的自上而下光刻制备技术在该范围内难以实现。尽管这些体系的研究重点多集中在制备光子带隙上，但这类晶格也能产生光子能带的拓扑特征。迄今为止，尚未有关于在可自组装光子晶体中实现拓扑光子特征的方案被提出。在三维体系中，外尔点是一种拓扑简并点，因其对扰动具有鲁棒性且存在对应的费米弧表面态而备受关注。要实现外尔点，必须破坏时间反演对称性或空间反演对称性，而此前尚无自组装胶体光子晶体表现出这两种特性。在此，我们基于近期金刚石光子晶体自组装的研究进展，提出了一种新型闪锌矿结构，该结构缺乏空间反演对称性，可支持光子外尔点。此外，我们表明该结构可被优化，使外尔点及其费米弧表面态在光子晶体的投影能带结构中可被实验观测。最后，我们进行分子动力学模拟，证明我们提出的用于观测外尔点的结构可通过真实的粒子间相互作用实现自组装。综上，这些结果为组装大规模光子晶体提供了一个平台，该晶体可在可见光和近红外范围内支持拓扑简并点和鲁棒的费米弧表面态。
英文摘要
Colloidal self-assembly has long been proposed as a method for growing large-scale three-dimensional photonic crystals with important optical properties in visible and near-infrared wavelength regimes, where top down lithographic fabrication fails. While much of the focus in these systems has been on producing a photonic band gap, such lattices can also give rise to topological features of photonic bands. To date, there has been no proposal for realizing topological photonic features in photonic crystals that may be self-assembled. In 3D, Weyl points are topological band degeneracies that are of particular interest due to their robustness to perturbations and their corresponding Fermi arc surface states. In order to realize Weyl points, either time-reversal or inversion symmetry must be broken, and no previous self-assembled colloidal photonic crystal has exhibited either property. Here, we propose a new zinc-blende structure, built off of recent progress in self-assembling diamond photonic crystals, which lacks inversion symmetry and supports photonic Weyl points. Furthermore, we show that the geometry can be optimized to make the Weyl point and its Fermi arc surface states experimentally observable in the photonic crystal's projected band structure. Finally, we perform molecular dynamics simulations to demonstrate that the geometry we propose for observing Weyl points is capable of being self-assembled with realistic interparticle interactions. Together, these results provide a platform for the assembly of large-scale photonic crystals supporting topological degeneracies and robust Fermi arc surface states in the visible and near-infrared.
