| ATOMIC AND MOLECULAR PHYSICS |
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Width-Dependent Optical Properties for Zigzag-Edge Silicene Nanoribbons |
| Hai-Rui Bao1, Wen-Hu Liao1,2**, Xin-Cheng Zhang1, Min Zuo1 |
1College of Physics, Mechanical and Electrical Engineering, Jishou University, Jishou 416000
2Key Laboratory of Mineral Cleaner Production and Exploit of Green Functional Materials in Hunan Province, Jishou University, Jishou 416000
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| Cite this article: |
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Hai-Rui Bao, Wen-Hu Liao, Xin-Cheng Zhang et al 2018 Chin. Phys. Lett. 35 013301 |
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Abstract We study theoretically the optical response for perfect zigzag-edge silicene nanoribbons with $N$ silicon atoms of the A and B sublattices ($N$-ZSiNRs) under the irradiation of an external electromagnetic field at low temperatures. The 8- and 16-ZSiNRs are demonstrated to exhibit a broad energy regime of absorption coefficient, refractive index, extinction coefficient, and reflectivity from infrared to ultraviolet, utilizing the dipole-transition theorem for semiconductors. The optical spectra for 8- and 16-ZSiNRs may be classified into two types of the transitions, one between valence and conduction subbands with the same parity, and the other among the edge state and bulk state subbands. With the increase of the ribbon width, the optical spectra for ZSiNRs are proved to exhibit red shift and blue shift at the lower and higher energy regimes, respectively. The obtained novel features are believed to be of significance in designs of silicene-based optoelectronic devices.
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Received: 25 September 2017
Published: 17 December 2017
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| PACS: |
33.20.Ea
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(Infrared spectra)
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42.25.Bs
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(Wave propagation, transmission and absorption)
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07.57.Hm
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(Infrared, submillimeter wave, microwave, and radiowave sources)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11664010 and 11264013, the Hunan Provincial Natural Science Foundation of China under Grant Nos 2017JJ2217 and 12JJ4003, the Scientific Research Fund of Hunan Provincial Education Department of China under Grant No 14B148, the Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province, the Innovation Project for Postgraduate of Hunan Province under Grant No CX2015B549, and the Research Program of Jishou University under Grant Nos 15JDY026 and Jdy16021. |
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