论文标题
伪源性和山谷 - 霍尔式边缘状态在带有$ c_ {3v} $对称性的光子晶体中的共存
Coexistence of pseudospin- and valley-Hall-like edge states in a photonic crystal with $C_{3v}$ symmetry
论文作者
论文摘要
我们证明了具有$ c_ {3v} $对称性的光子晶体中伪植物和山谷 - 霍尔样边缘状态的共存，该光子晶体由三个带有相同晶格常量的三个交织的三角形三角形sublattices组成。通过调整sublatices的几何形状，可以创建三个具有非平凡拓扑结构的完整的光子带隙，其中之一是由于带与$γ$点的伪源性自由度相关的频段倒置，而其他两个是由于与dirac锥体相关的与valley自由度相关的差异，$ k，$ k，k，k，k，k，k'$。该系统可以在正确设计的域壁接口处支持三波段伪s和Valley-momentum锁定边缘状态。此外，为了在单个配置中演示两种边缘状态的新型相互作用，我们设计了一个四通道系统，在该系统中，电磁波的单向路由与两个套件之间的尖锐弯曲的单向路由可以由伪季节和瓦利自由度选择性地控制两个套件。我们的作品将伪源性和山谷自由度结合在单个配置中，并且可以在操纵电磁波中具有更大的灵活性，具有多功能和多功能应用的有希望的潜力。
We demonstrate the coexistence of pseudospin- and valley-Hall-like edge states in a photonic crystal with $C_{3v}$ symmetry, which is composed of three interlacing triangular sublattices with the same lattice constants. By tuning the geometry of the sublattices, three complete photonic band gaps with nontrivial topology can be created, one of which is due to the band inversion associated with the pseudospin degree of freedom at the $Γ$ point and the other two due to the gapping out of Dirac cones associated with the valley degree of freedom at the $K, K'$ points. The system can support tri-band pseudospin- and valley-momentum locking edge states at properly designed domain-wall interfaces. Furthermore, to demonstrate the novel interplay of the two kinds of edge states in a single configuration, we design a four-channel system, where the unidirectional routing of electromagnetic waves against sharp bends between two routes can be selectively controlled by the pseudospin and valley degrees of freedom. Our work combines the pseudospin and valley degrees of freedom in a single configuration and may provide more flexibility in manipulating electromagnetic waves with promising potential for multiband and multifunctional applications.
