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Observation of interlayer phonon modes in van der Waals heterostructures

Author(s)
Ye, Zhipeng; Ji, Chao; Chiu, Kuan-Chang; Chou, Cheng-Tse; Means-Shively, Casie; Anderson, Heidi; Wu, Jenn-Ming; Kidd, Tim; Lee, Yi-Hsien; He, Rui; Lui, Chun Hung; Andersen, Trond; ... Show more Show less
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Abstract
We have investigated the vibrational properties of van der Waals heterostructures of monolayer transition metal dichalcogenides (TMDs), specifically MoS[subscript 2]/WSe[subscript 2] and MoSe[subscript 2]/MoS[subscript 2] heterobilayers and twisted MoS[subscript 2] bilayers, by means of ultralow-frequency Raman spectroscopy. We discovered Raman features (at 30–40cm[superscript −1]) that arise from the layer-breathing mode (LBM) vibration 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 an atomically clean interface. Its frequency also evolves systematically with the relative orientation between the two layers. Our research demonstrates that the LBM can serve as a sensitive probe to the interface environment and interlayer interactions in van der Waals materials.
Date issued
2015-04
URI
http://hdl.handle.net/1721.1/96669
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review B
Publisher
American Physical Society
Citation
Lui, C. H., et al. "Observation of interlayer phonon modes in van der Waals heterostructures." Phys. Rev. B 91, 165403 (April 2015). © 2015 American Physical Society
Version: Final published version
ISSN
1098-0121
1550-235X

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