Abstract
Naturally occurring hyperbolic plasmonic media is rare, and was only recently observed in the phase of . We elucidate on the physical origin of this strong infrared hyperbolic response, and attribute it to band-nested anisotropic interband transitions. Such a 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 via strain engineering, which is otherwise nonhyperbolic.
- Received 14 May 2020
- Accepted 9 October 2020
DOI:https://doi.org/10.1103/PhysRevB.102.241104
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