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The optical conductivity of few-layer black phosphorus by infrared spectroscopy

Author

Listed:
  • Guowei Zhang

    (Fudan University
    Northwestern Polytechnical University)

  • Shenyang Huang

    (Fudan University)

  • Fanjie Wang

    (Fudan University)

  • Qiaoxia Xing

    (Fudan University)

  • Chaoyu Song

    (Fudan University)

  • Chong Wang

    (Fudan University)

  • Yuchen Lei

    (Fudan University)

  • Mingyuan Huang

    (Southern University of Science and Technology)

  • Hugen Yan

    (Fudan University)

Abstract

The strength of light-matter interaction is of central importance in photonics and optoelectronics. For many widely studied two-dimensional semiconductors, such as MoS2, the optical absorption due to exciton resonances increases with thickness. However, here we will show, few-layer black phosphorus exhibits an opposite trend. We determine the optical conductivity of few-layer black phosphorus with thickness down to bilayer by infrared spectroscopy. On the contrary to our expectations, the frequency-integrated exciton absorption is found to be enhanced in thinner samples. Moreover, the continuum absorption near the band edge is almost a constant, independent of the thickness. We will show such scenario is related to the quanta of the universal optical conductivity of graphene (σ0 = e2/4ħ), with a prefactor originating from the band anisotropy.

Suggested Citation

  • Guowei Zhang & Shenyang Huang & Fanjie Wang & Qiaoxia Xing & Chaoyu Song & Chong Wang & Yuchen Lei & Mingyuan Huang & Hugen Yan, 2020. "The optical conductivity of few-layer black phosphorus by infrared spectroscopy," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-15699-7
    DOI: 10.1038/s41467-020-15699-7
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    Cited by:

    1. Yuchen Lei & Junwei Ma & Jiaming Luo & Shenyang Huang & Boyang Yu & Chaoyu Song & Qiaoxia Xing & Fanjie Wang & Yuangang Xie & Jiasheng Zhang & Lei Mu & Yixuan Ma & Chong Wang & Hugen Yan, 2023. "Layer-dependent exciton polarizability and the brightening of dark excitons in few-layer black phosphorus," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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