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Observation of Interlayer Phonon Modes in Van Der Waals Heterostructures
Physical Review (2015)
  • Chun Hung Lui, Massachusetts Institute of Technology
  • Zhipeng Ye, University of Northern Iowa
  • Chao Ji, University of Northern Iowa
  • Kuan-Chang Chiu, National Tsinghua University
  • Cheng-Tse Chou, National Tsinghua University
  • Trond I. Andersen, Massachusetts Institute of Technology
  • Casie Means-Shively, University of Northern Iowa
  • Heidi Anderson, University of Northern Iowa
  • Jenn-Ming Wu, National Tsinghua University
  • Tim Kidd, University of Northern Iowa
  • Yi-Hsien Lee, National Tsinghua University
  • Rui He, University of Northern Iowa
We have investigated the vibrational properties of van der Waals heterostructures of monolayer transition metal dichalcogenides (TMDs), specifically MoS2/WSe2 and MoSe2/MoS2 heterobilayers as well as twisted MoS2 bilayers, by means of ultralow-frequency Raman spectroscopy. We discovered Raman features (at 30 ~ 40 cm-1 ) that arise from the layer-breathing mode (LBM) vibrations between the two incommensurate TMD monolayers in these structures. The LBM Raman intensity correlates strongly with the suppression of photoluminescence that arises from interlayer charge transfer. The LBM is generated only in bilayer areas with direct layer-layer contact and atomically clean interface. Its frequency also evolves systematically with the relative orientation between of the two layers. Our research demonstrates that LBM can serve as a sensitive probe to the interface environment and interlayer interactions in van der Waals materials. 
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Citation Information
Chun Hung Lui, Zhipeng Ye, Chao Ji, Kuan-Chang Chiu, et al.. "Observation of Interlayer Phonon Modes in Van Der Waals Heterostructures" Physical Review Vol. 91 (2015)
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