Prediction of hyperbolic exciton-polaritons in monolayer black phosphorus

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...

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Bibliographic Details
Published in:Nature communications 2021-09, Vol.12 (1), p.5628-5628, Article 5628
Main Authors: Wang, Fanjie, Wang, Chong, Chaves, Andrey, Song, Chaoyu, Zhang, Guowei, Huang, Shenyang, Lei, Yuchen, Xing, Qiaoxia, Mu, Lei, Xie, Yuangang, Yan, Hugen
Format: Article
Language:English
Subjects:
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639/301/357/995
639/624/400/2797
639/766/119/1000/1018
639/766/119/995
639/925/357/995
Anisotropy
Excitation spectra
Excitons
Humanities and Social Sciences
Layered materials
Metamaterials
Monolayers
multidisciplinary
Phonons
Phosphorene
Phosphorus
Plasmons
Polaritons
Science
Science (multidisciplinary)
Spectroscopy
Spectrum analysis
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Summary: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 MoO 3 and WTe 2 , 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. Naturally occurring hyperbolic polaritons exist in a class of layered materials. Here, the authors show evidence, via optical spectroscopy, of hyperbolic exciton-polaritons in phosphorene, originating from its in-plane anisotropy and strong exciton resonances.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-021-25941-5