Hyperbolicity in 2D transition metal ditellurides induced by electronic bands nesting
arXiv:2005.05416 · doi:10.1103/PhysRevB.102.241104
Abstract
Naturally occurring hyperbolic plasmonic media is rare, and was only recently observed in the 1T phase of WTe. 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 via strain engineering, which is otherwise non-hyperbolic.
arXiv comment5 pages, 4 figures
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