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Title: Vibrational spectrum renormalization by enforced coupling across the van der Waals gap between MoS2 and WS2 monolayers
Authors: Fan, Wen
Zhu, Xi
Ke, Feng
Chen, Yabin
Dong, Kaichen
Ji, Jie
Chen, Bin
Tongay, Sefaattin
Ager, Joel W.
Liu, Kai
Su, Haibin
Wu, Junqiao
Issue Date: 2015
Source: Fan, W., Zhu, X., Ke, F., Chen, Y., Dong, K., Ji, J., et al. (2015). Vibrational spectrum renormalization by enforced coupling across the van der Waals gap between MoS2 and WS2 monolayers. Physical Review B, 92, 241408-.
Series/Report no.: Physical Review B
Abstract: At the few or monolayer limit, layered materials define an interesting two-dimensional system with unique electronic and phonon properties. The electron band structure of monolayers can be drastically different from multilayers despite the weak van der Waals interaction between neighboring layers. In this Rapid Communication, we demonstrate that vibrational spectra of a MoS2 monolayer and a WS2 monolayer are also renormalized when the interaction between them is artificially modulated. This is achieved by using a diamond-anvil cell to apply high pressures, up to 39 GPa onto WS2/MoS2 heterobilayers. With increasing pressure, the out-of-plane Raman frequencies of the two individual monolayers repel each other, exhibiting coherent vibrations across the van der Waals gap with an optical-like and an acousticlike interlayer vibration mode. The discovery shows a crossover in lattice vibration from a two-dimensional system toward a three-dimensional system driven by enforced interlayer coupling.
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.92.241408
Rights: © 2015 American Physical Society. This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society. The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles


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