二维过渡金属二碲化物电子能带嵌套引起的双曲性
Hyperbolicity in 2D transition metal ditellurides induced by electronic bands nesting
摘要：
天然存在的双曲等离子体介质是罕见的，并且最近才在WTe $_2$的1T $'$相中观察到。我们阐明了这种强红外双曲响应的物理起源，并将其归因于带嵌套各向异性带间跃迁。这种现象在一般的各向异性材料中不会发生，至少在其原始状态下不会发生。然而，带嵌套的各向异性带间跃迁，原则上可以通过适当的电子带嵌套诱导。我们说明了这一原则，并通过应变工程，这是否则非双曲的MoTe $_2$的拓扑椭圆到双曲过渡。
英文摘要：
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.
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