Large second-harmonic generation and linear electro-optic effect in trigonal selenium and tellurium

  title={Large second-harmonic generation and linear electro-optic effect in trigonal selenium and tellurium},
  author={Mei-Shiow Cheng and Shunqing Wu and Zi-zhong Zhu and G. Y. Guo},
  journal={Physical Review B},
Trigonal selenium and tellurium crystalize in helical chain-like structures and thus possess interesting properties such as current-induced spin polarization, gyrotropic effects and nonlinear optical responses. By performing systematic ab initio calculations based on density functional theory in the generalized gradient approximation plus scissors correction, we study their linear and nonlinear optical (NLO) properties. We find that the two materials exhibit significant second-harmonic… 
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