论文标题
由具有不同对称性的Weyl半法组成的波导中的表面等离子体极化子
Surface plasmon polaritons in a waveguide composed of Weyl semimetals with different symmetries
论文作者
论文摘要
Weyl Semimetals（WSM）的特殊拓扑特性导致了异常和独特的光学特性。我们研究了表面等离子体极性子（SPP）的新型特征，该插槽波导由两个半无限的WSM组成，具有不同的对称性，一个具有破碎的时间反向对称性（TR），另一个具有破裂的反转对称性。我们考虑在WSM的接口上使用断裂的TRS的spps和Faraday配置。我们证明，在VOIGT配置中，该结构支持大量等离子体频率上方的单向SPP模式，同时显示出在大块等离子体频率下方的表面等离子体极化子的非对流双向色散。特别是，我们表明SPP的手性质可以通过WSM的拓扑特性和化学潜力来调节。此外，在法拉第配置中，我们在SPP色散中找到了可调差距。具有这些异国情调特征的研究结构可以用作手性光电设备的构件之一。
The peculiar topological properties of Weyl semimetals (WSMs) lead to unusual and unique optical properties. We investigate novel features of surface plasmon polaritons (SPPs) in a slot waveguide comprised of two semi-infinite WSMs with different symmetries, one with broken time reversal symmetry (TRS) and the other with broken inversion symmetry. We consider Voigt and Faraday configurations for SPPs at the interface of the WSM with broken TRS. We demonstrate that in the Voigt configuration this structure supports unidirectional SPP modes above the bulk plasmon frequency while it shows a non-reciprocal bidirectional dispersion for surface plasmon polaritons below the bulk plasmon frequency. In particular, we show that the chiral nature of the SPPs can be tuned by the topological properties and chemical potential of the WSMs. Moreover, in the Faraday configuration we find a tunable gap in the SPP dispersion. The studied structures possessing these exotic features may be employed as one of the building blocks of the chiral optoelectronic devices.
