Stacking symmetry governed second harmonic generation in graphene trilayers

@inproceedings{Shan2018StackingSG,
  title={Stacking symmetry governed second harmonic generation in graphene trilayers},
  author={Yuwei Shan and Yingguo Li and Di Huang and Qingjun Tong and Wang Yao and Wei-Tao Liu and Shiwei Wu},
  booktitle={Science Advances},
  year={2018}
}
Crystal symmetry plays a central role in governing a wide range of fundamental physical phenomena. One example is nonlinear optical second harmonic generation (SHG), which requires inversion symmetry breaking. We report a unique stacking-induced SHG in graphene trilayers, whose individual monolayer sheet is centrosymmetric. Depending on layer stacking sequence, we observe a strong optical SHG in a Bernal ABA–stacked non-centrosymmetric trilayer, while it vanishes in a rhombohedral ABC–stacked… CONTINUE READING
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