Observation of Interlayer Phonon Modes in van der Waals Heterostructures

Authors

C. H. Lui, Massachusetts Institute of TechnologyFollow
Zhipeng Ye, University of Northern IowaFollow
Chao Ji, University of Northern IowaFollow
Kuan-Chang Chiu, National Tsing Hua UniversityFollow
Cheng-Tse Chou, National Tsing Hua UniversityFollow
Trond I. Andersen, Massachusetts Institute of TechnologyFollow
Casie Means-Shively, University of Northern IowaFollow
Heidi Anderson, University of Northern IowaFollow
Jenn-Ming Wu, National Tsing Hua UniversityFollow
Tim Kidd, University of Northern IowaFollow
Yi-Hsien Lee, National Tsing Hua UniversityFollow
Rui He, University of Northern IowaFollow

Document Type

Article

Journal/Book/Conference Title Title

Physical Review B

Volume

91

Issue

16

First Page

165403-1

Last Page

165403-7

Abstract

We have investigated the vibrational properties of van der Waals heterostructures of monolayer transition metal dichalcogenides (TMDs), specifically MoS₂/WSe₂ and MoSe₂/MoS₂ heterobilayers and 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) 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.

Department

Department of Physics

Comments

First published in Physical Review B, v. 91, no. 16, published by American Physical Society. DOI; 10.1103/PhysRevB.91.165403

Original Publication Date

4-8-2015

DOI of published version

10.1103/PhysRevB.91.165403

Repository

UNI ScholarWorks, University of Northern Iowa, Rod Library

Copyright

©2015 C.H. Lui, Zhipeng Ye, Chao Ji, Kuan-Chang Chiu, Cheng-Tse Chou, Rond I. Andersen, Casie Means-Shively, Heidi Anderson, Jenn-Ming Wu, Tim Kidd, Yi-Hsien Lee, and Rui He. The copyright holder has granted permission for posting

Date Digital

2015

Language

EN

File Format

application/pdf

Recommended Citation

Lui, C. H.; Ye, Zhipeng; Ji, Chao; Chiu, Kuan-Chang; Chou, Cheng-Tse; Andersen, Trond I.; Means-Shively, Casie; Anderson, Heidi; Wu, Jenn-Ming; Kidd, Tim; Lee, Yi-Hsien; and He, Rui, "Observation of Interlayer Phonon Modes in van der Waals Heterostructures" (2015). Faculty Publications. 3.
https://scholarworks.uni.edu/phy_facpub/3