Width-Dependent Optical Properties for Zigzag-Edge Silicene Nanoribbons
Hai-Rui Bao1 , Wen-Hu Liao1,2** , Xin-Cheng Zhang1 , Min Zuo1
1 College of Physics, Mechanical and Electrical Engineering, Jishou University, Jishou 4160002 Key Laboratory of Mineral Cleaner Production and Exploit of Green Functional Materials in Hunan Province, Jishou University, Jishou 416000
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.
收稿日期: 2017-09-25
出版日期: 2017-12-17
:
33.20.Ea
(Infrared spectra)
42.25.Bs
(Wave propagation, transmission and absorption)
07.57.Hm
(Infrared, submillimeter wave, microwave, and radiowave sources)
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2018, Vol. 35 
