期刊
NATURE COMMUNICATIONS
卷 11, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41467-020-15699-7
关键词
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资金
- National Young 1000 Talents Plan
- National Science Foundation of China [11874009, 11734007]
- National Key Research and Development Program of China [2016YFA0203900, 2017YFA0303504]
- Chinese Academy of Sciences [XDB30000000]
- Shanghai Municipal Education Commission
- Initiative Funds for Shenzhen High Class University [G02206301]
- National Natural Science Foundation of China [11804398]
- Natural Science Basic Research Program of Shaanxi [2020JQ-105]
- Open Research Fund of State Key Laboratory of Surface Physics
- Fundamental Research Funds for the Central Universities
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 (sigma(0) = e(2)/4h), with a prefactor originating from the band anisotropy.
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