论文标题
由电子带嵌套诱导的2D过渡金属双尿素中的双曲线
Hyperbolicity in 2D transition metal ditellurides induced by electronic bands nesting
论文作者
论文摘要
天然发生的双曲线等离子介质很少见，直到最近才在WTE $ _2 $的1t $'$ phase中观察到。我们阐明了这种强红外双曲线响应的物理起源，并将其归因于带状圈的各向异性边界间跃迁。这种现象在一般各向异性材料中并不是在其原始状态中发生的。但是，原则上可以通过适当的电子带嵌套诱导带状纽扣的各向异性侧带跃迁。我们说明了这一原理，并通过应变工程表明了Mote $ _2 $中的拓扑椭圆形到毛细血管过渡，否则这是非纤维性的。
Naturally occurring hyperbolic plasmonic media is rare, and was only recently observed in the 1T$'$ phase of WTe$_2$. We elucidate on the physical origin of this strong infrared hyperbolic response, and attribute it to band-nested anisotropic interband transitions. Such phenomenon does not occur in general anisotropic materials, at least not in their pristine state. However, band-nested anisotropic interband transitions can in principle be induced via proper electronic band nesting. We illustrate this principle and demonstrate a topological elliptic-to-hyperbolic transition in MoTe$_2$ via strain engineering, which is otherwise non-hyperbolic.
