关键词: 二维层状碳化硅/
非线性光学二次谐波/
角度依赖/
拉伸
English Abstract
First-principles study of stacking effect on second harmonic generation of graphene-like two-dimensional silicon carbide
Shi Jia-Yu,Lan You-Zhao
1.College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant No. 21303164).Received Date:10 July 2018
Accepted Date:05 September 2018
Published Online:05 November 2018
Abstract:Two-dimensional layered silicon carbide (2d-SiC), a semiconductor with graphene-like structure, has potential applications in nonlinear optical frequency conversion. The effect of stacking and strain on the nonlinear second harmonic generation (SHG) coefficient are studied by using the first-principles calculation of the all-electron full-potential linearized augmented-plane wave combined with the sum-over-states method. The analysis of physical origin of the SHG process shows that the single-particle transition channel formed by three bands dominates the SHG process of 2d-SiC. The interband motion of electrons is significantly tuned by the intraband motion. The angle dependence of the SHG coefficient of 2d-SiC is given as a reference for future experiments. A tunable SHG enhancement could be obtained by straining 2d-SiC.
Keywords: two-dimensional layered silicon carbide/
nonlinear optical second harmonic/
angular dependence/
strain
