Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session K13: 2D Materials (General) -- Topology and Exotic Phenomena
8:00 AM–11:00 AM,
Wednesday, March 6, 2019
BCEC
Room: 153B
Sponsoring
Units:
DMP DCOMP
Chair: Adina Luican-Mayer, Univ of Ottawa
Abstract: K13.00013 : Stacking-dependent interlayer phonons in 3R and 2H MoS2
10:48 AM–11:00 AM
Presenter:
Jeremiah Van Baren
(Department of Physics and Astronomy, University of California, Riverside)
Authors:
Jeremiah Van Baren
(Department of Physics and Astronomy, University of California, Riverside)
Gaihua Ye
(Department of Electrical and Computer Engineering, Texas Tech University)
Zhipeng Ye
(Department of Electrical and Computer Engineering, Texas Tech University)
Pouyan Rezaie
(Department of Electrical and Computer Engineering, Texas Tech University)
Jia-An Yan
(Department of Physics, Astronomy, and Geosciences, Towson University)
Yu Peng
(Centre for Programmed Materials, School of Materials Science and Engineering, Nanyang Technological University)
Zheng Liu
(Centre for Programmed Materials, School of Materials Science and Engineering, Nanyang Technological University)
Rui He
(Department of Electrical and Computer Engineering, Texas Tech University)
Chun Hung Lui
(Department of Physics and Astronomy, University of California, Riverside)
We have directly probed the stacking-dependent interlayer coupling in the pure 2H and 3R structure of MoS2 by ultralow-frequency Raman spectroscopy. We observe up to three shear branches and four breathing branches in MoS2 samples with thickness from 2 to 13 layers. Our results show distinct behavior of the shear modes between 2H and 3R MoS2, and also suggest a slightly enhanced interlayer coupling in 2H MoS2 compared to 3R MoS2. Through a combination first-principles calculations, group theory, and an effective bond-polarizability model, we account for all the major observations in our experiment.
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