From Anomalous to Normal: Temperature Dependence of the Band Gap in Two-Dimensional Black Phosphorus

The temperature dependence of the band gap is crucial to a semiconductor. Bulk black phosphorus is known to exhibit an anomalous behavior. Through optical spectroscopy, here we show that the temperature effect on black phosphorus band gap gradually evolves with decreasing layer number, eventually tu...

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Bibliographic Details
Published in:Physical review letters 2020-10, Vol.125 (15), p.1-156802, Article 156802
Main Authors: Huang, Shenyang, Wang, Fanjie, Zhang, Guowei, Song, Chaoyu, Lei, Yuchen, Xing, Qiaoxia, Wang, Chong, Zhang, Yujun, Zhang, Jiasheng, Xie, Yuangang, Mu, Lei, Cong, Chunxiao, Huang, Mingyuan, Yan, Hugen
Format: Article
Language:English
Subjects:
Energy gap
Interlayers
Optical resonance
Phosphorus
Temperature dependence
Temperature effects
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Summary:The temperature dependence of the band gap is crucial to a semiconductor. Bulk black phosphorus is known to exhibit an anomalous behavior. Through optical spectroscopy, here we show that the temperature effect on black phosphorus band gap gradually evolves with decreasing layer number, eventually turns into a normal one in the monolayer limit, rendering a crossover from the anomalous to the normal. Meanwhile, the temperature-induced shift in optical resonance also differs with different transition indices for the same thickness sample. A comprehensive analysis reveals that the temperature-tunable interlayer coupling is responsible for the observed diverse scenario. Our study provides a key to the apprehension of the anomalous temperature behavior in certain layered semiconductors.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.125.156802