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Prediction of hyperbolic exciton-polaritons in monolayer black phosphorus

Author

Listed:
  • Fanjie Wang

    (Fudan University)

  • Chong Wang

    (Beijing Institute of Technology
    Beijing Institute of Technology)

  • Andrey Chaves

    (Universidade Federal do Ceará
    University of Antwerp)

  • Chaoyu Song

    (Fudan University)

  • Guowei Zhang

    (Institute of Flexible Electronics, Northwestern Polytechnical University)

  • Shenyang Huang

    (Fudan University)

  • Yuchen Lei

    (Fudan University)

  • Qiaoxia Xing

    (Fudan University)

  • Lei Mu

    (Fudan University)

  • Yuangang Xie

    (Fudan University)

  • Hugen Yan

    (Fudan University
    Collaborative Innovation Center of Advanced Microstructures)

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.

Suggested Citation

  • Fanjie Wang & Chong Wang & Andrey Chaves & Chaoyu Song & Guowei Zhang & Shenyang Huang & Yuchen Lei & Qiaoxia Xing & Lei Mu & Yuangang Xie & Hugen Yan, 2021. "Prediction of hyperbolic exciton-polaritons in monolayer black phosphorus," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-25941-5
    DOI: 10.1038/s41467-021-25941-5
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    Cited by:

    1. Francesco L. Ruta & Shuai Zhang & Yinming Shao & Samuel L. Moore & Swagata Acharya & Zhiyuan Sun & Siyuan Qiu & Johannes Geurs & Brian S. Y. Kim & Matthew Fu & Daniel G. Chica & Dimitar Pashov & Xiaod, 2023. "Hyperbolic exciton polaritons in a van der Waals magnet," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    2. Hongwei Wang & Anshuman Kumar & Siyuan Dai & Xiao Lin & Zubin Jacob & Sang-Hyun Oh & Vinod Menon & Evgenii Narimanov & Young Duck Kim & Jian-Ping Wang & Phaedon Avouris & Luis Martin Moreno & Joshua C, 2024. "Planar hyperbolic polaritons in 2D van der Waals materials," Nature Communications, Nature, vol. 15(1), pages 1-14, December.
    3. Rao Fu & Yusong Qu & Mengfei Xue & Xinghui Liu & Shengyao Chen & Yongqian Zhao & Runkun Chen & Boxuan Li & Hongming Weng & Qian Liu & Qing Dai & Jianing Chen, 2024. "Manipulating hyperbolic transient plasmons in a layered semiconductor," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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