Prediction of hyperbolic exciton-polaritons in monolayer black phosphorus
arXiv:2109.12757 · doi:10.1038/s41467-021-25941-5
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 peak and weaker excited states in high quality monolayer samples in the reflection spectrum, which enables us to determine the exciton binding energy of ~452 meV. Our work provides another appealing platform for the in-plane natural hyperbolic polaritons, which is based on excitons rather than phonons or plasmons.
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- Infrared Plasmons Propagate through a Hyperbolic Nodal Metal
- In-plane Exciton Polaritons vs Plasmon Polaritons: Nonlocal corrections, confinement and loss
- Electrically Driven Hyperbolic Nanophotonic Resonators as High Speed, Spectrally Selective Thermal Radiators
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- Interaction effects on electronic Floquet spectra: Excitonic effects
- Unraveling phase transformation with phononic hyperbolicity using off-resonant terahertz light