Strong second harmonic generation in two-dimensional ferroelectric IV-monochalcogenides.

  title={Strong second harmonic generation in two-dimensional ferroelectric IV-monochalcogenides.},
  author={Suman Raj Panday and Benjamin M. Fregoso},
  journal={Journal of physics. Condensed matter : an Institute of Physics journal},
  volume={29 43},
The two-dimensional ferroelectrics GeS, GeSe, SnS and SnSe are expected to have large spontaneous in-plane electric polarization and enhanced shift-current response. Using density functional methods, we show that these materials also exhibit the largest effective second harmonic generation reported so far. It can reach magnitudes up to [Formula: see text] which is about an order of magnitude larger than that of prototypical GaAs. To rationalize this result we model the optical response with a… 

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