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

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

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37 Citations (Scopus)


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 high-yield technique of atomic-layer TMDs.

Original languageEnglish
Pages (from-to)793-797
Number of pages5
JournalNano letters
Issue number2
Publication statusPublished - 2018 Feb 14

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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