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Strain-shear coupling in bilayer MoS2

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Title
Strain-shear coupling in bilayer MoS2
Author(s)
Jae-Ung Lee; Sungjong Woo; Jaesung Park; Hee Chul Park; Young-Woo Son; Hyeonsik Cheong
Publication Date
2017-11
Journal
NATURE COMMUNICATIONS, v.8, no.1, pp.1370 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Layered materials such as graphite and transition metal dichalcogenides have extremely anisotropic mechanical properties owing to orders of magnitude difference between in-plane and out-of-plane interatomic interaction strengths. Although effects of mechanical perturbations on either intralayer or interlayer interactions have been extensively investigated, mutual correlations between them have rarely been addressed. Here, we show that layered materials have an inevitable coupling between in-plane uniaxial strain and interlayer shear. Because of this, the uniaxial in-plane strain induces an anomalous splitting of the degenerate interlayer shear phonon modes such that the split shear mode along the tensile strain is not softened but hardened contrary to the case of intralayer phonon modes. We confirm the effect by measuring Raman shifts of shear modes of bilayer MoS2 under strain. Moreover, by analyzing the splitting, we obtain an unexplored off-diagonal elastic constant, demonstrating that Raman spectroscopy can determine almost all mechanical constants of layered materials. © The Author(s) 2017
URI
http://pr.ibs.re.kr/handle/8788114/3990
DOI
10.1038/s41467-017-01487-3
ISSN
2041-1723
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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