Probing symmetry properties of few-layer MoS2 and h-BN by optical second-harmonic generation.

  title={Probing symmetry properties of few-layer MoS2 and h-BN by optical second-harmonic generation.},
  author={Yu Bo Li and Yi Rao and Kin Fai Mak and Yumeng You and Shuyuan Wang and Cory R. Dean and Tony F Heinz},
  journal={Nano letters},
  volume={13 7},
We have measured optical second-harmonic generation (SHG) from atomically thin samples of MoS2 and h-BN with one to five layers. We observe strong SHG from materials with odd layer thickness, for which a noncentrosymmetric structure is expected, while the centrosymmetric materials with even layer thickness do not yield appreciable SHG. SHG for materials with odd layer thickness was measured as a function of crystal orientation. This dependence reveals the rotational symmetry of the lattice and… CONTINUE READING
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Second - Order Nonlinear Optical E ff ects at Surfaces and Interfaces : Recent Advances

G. A. Reider, T. F. Heinz
Photonic Probes of Surfaces : Electromagnetic Waves

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