论文标题
在t $ _ {d} \，$ - wte $ _2 $单层中，可调低损坏双曲线等离子体极化
Tunable Low-Loss Hyperbolic Plasmon Polaritons in a T$_{d}\,$-WTe$_2$ Single Layer
论文作者
论文摘要
天然双曲线二维系统是一种引人入胜的材料类别，可以为操纵等离子体传播和轻度 - 物质相互作用打开替代途径。在这里，我们通过密度官能和多体扰动理论介绍了t $ _d \，$ - wte $ _2 $中的光学响应的全面研究。我们展示了带有面内各向异性的单层WTE $ _2 $如何维持双曲线等离子体极化子，这可以通过化学掺杂和应变来调整。后者能够将双曲线状态延伸到近红外线的损失低。此外，随着适度的压力，WTE $ _2 $甚至可以在椭圆形和双曲线机制之间切换。此外，WTE $ _2 $中的等离子的特征是由于电子 - 光子散射而导致低损耗，这是负责等离子线宽度的温度依赖性的。有趣的是，温度也可以用于调整WTE $ _2 $光学响应的面内各向异性。
Natural hyperbolic two-dimensional systems are a fascinating class of materials that could open alternative pathways to the manipulation of plasmon propagation and light-matter interactions. Here, we present a comprehensive study of the optical response in T$_d\,$-WTe$_2$ by means of density-functional and many-body perturbation theories. We show how monolayer WTe$_2$ with in-plane anisotropy sustains hyperbolic plasmon polaritons, which can be tuned via chemical doping and strain. The latter is able to extend the hyperbolic regime toward the near infrared with low losses. Moreover, with a moderate strain, WTe$_2$ can even be switched between elliptic and hyperbolic regimes. In addition, plasmons in WTe$_2$ are characterized by low losses owing to electron-phonon scattering, which is responsible for the temperature dependence of the plasmon line width. Interestingly, the temperature can also be utilized to tune the in-plane anisotropy of the WTe$_2$ optical response.
