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Atom-Dependent Edge-Enhanced Second-Harmonic Generation on MoS2 Monolayers

Edge morphology and lattice orientation of single-crystal molybdenum disulfide (MoS2) monolayers, a transition metal dichalcogenide (TMD), possessing a triangular shape with different edges grown by chemical vapor deposition are characterized by atomic force microscopy and transmission electron microscopy. Multiphoton laser scanning microscopy is utilized to study one-dimensional atomic edges of MoS2 monolayers with localized midgap electronic states, which result in greatly enhanced optical second-harmonic generation (SHG). Microscopic S-zigzag edge and S–Mo Klein edge (bare Mo atoms protruding from a S-zigzag edge) terminations and the edge-atom dependent resonance energies can therefore be deduced based on SHG images. Theoretical calculations based on density functional theory clearly explain the lower energy of the S-zigzag edge states compared to the corresponding S–Mo Klein edge states. Characterization of the atomic-scale variation of edge-enhanced SHG is a step forward in this full-optical and hig...

Authors:   Kuang-I Lin; Yen-Hung Ho; Shu-Bai Liu; Jian-Jhih Ciou; Bo-Ting Huang; Christopher Chen; Han-Ching Chang; Chien-Liang Tu; Chang-Hsiao Chen
Journal:   Nano Letters
Year:   2018
DOI:   10.1021/acs.nanolett.7b04006
Publication date:   17-Jan-2018
Facts, background information, dossiers
  • density functional theory
  • chemical vapor deposition
  • atoms
More about American Chemical Society Publications
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