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

Guowei Zhang; Shenyang Huang; Fanjie Wang; Qiaoxia Xing; Chaoyu Song; Chong Wang; Yuchen Lei; Mingyuan Huang; Hugen Yan

doi:10.1038/s41467-020-15699-7

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

Guowei Zhang, Shenyang Huang, Fanjie Wang, Qiaoxia Xing, Chaoyu Song, Chong Wang, Yuchen Lei, Mingyuan Huang, Hugen Yan^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

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.

Original language	English
Article number	1847
Journal	Nature Communications
Volume	11
Issue number	1
DOIs	https://doi.org/10.1038/s41467-020-15699-7
Publication status	Published - 1 Dec 2020
Externally published	Yes

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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.",

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AU - Zhang, Guowei

AU - Huang, Shenyang

AU - Wang, Fanjie

AU - Xing, Qiaoxia

AU - Song, Chaoyu

AU - Wang, Chong

AU - Lei, Yuchen

AU - Huang, Mingyuan

AU - Yan, Hugen

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AB - 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.

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

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