Observation of interlayer phonon modes in van der Waals heterostructures
Name
PhysRevB.91.165403.pdf
Size
3.54 MB
Format
Adobe PDF
Checksum (MD5)
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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
Date Issued
April 2015
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.91.165403
