Valley polarization in silicene induced by circularly-polarized resonance light

6th conference on Advances in Optoelectronics and Micro/nano-optics

Cao, Jie^1 ; Qi, Fenghua^2

College of Science, Hohai University, Nanjing

210098, China^1

School of Electronic Engineering, Nanjing Xiaozhuang University, Nanjing

211171, China^2

关键词: Circularly polarized;    Numerical calculation;    Photon energy;    Quasi-energy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/844/1/012016/pdf
DOI  :  10.1088/1742-6596/844/1/012016

来源: IOP

【 摘 要 】

In the presence of circularly-polarized resonance light, silicene develops dynamical band gaps in its quasi-energy band structure. Using numerical calculations, our results show that the gap appearing at hω/2, where hω is the photon energy. More importantly, we find that these gaps are non-symmetric for two inequivalent valleys. Therefore we can introduce light-controlled valley polarization in these dynamical band gaps. Different valleytronic devices can be realized using this technique.