Prediction of hyperbolic exciton-polaritons in monolayer black phosphorus.

ABSTRACT: Hyperbolic polaritons exhibit large photonic density of states and can be collimated in certain propagation directions. The majority of hyperbolic polaritons are sustained in man-made metamaterials. However, natural-occurring hyperbolic materials also exist. Particularly, natural in-plane hyperbolic polaritons in layered materials have been demonstrated in MoO₃ and WTe₂, which are based on phonon and plasmon resonances respectively. Here, by determining the anisotropic optical conductivity (dielectric function) through optical spectroscopy, we predict that monolayer black phosphorus naturally hosts hyperbolic exciton-polaritons due to the pronounced in-plane anisotropy and strong exciton resonances. We simultaneously observe a strong and sharp ground state exciton pea

SUBMITTER: Wang F 

PROVIDER: S-EPMC8463555 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature