Strain-shear coupling in bilayer MoS2
Condensed Matter - Materials Science
Science
Q
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
02 engineering and technology
0210 nano-technology
01 natural sciences
Article
0104 chemical sciences
DOI:
10.1038/s41467-017-01487-3
Publication Date:
2017-11-03T11:17:17Z
AUTHORS (6)
ABSTRACT
Abstract Layered materials such as graphite and transition metal dichalcogenides have extremely anisotropic mechanical properties owing to orders of magnitude difference between in-plane out-of-plane interatomic interaction strengths. Although effects perturbations on either intralayer or interlayer interactions been extensively investigated, mutual correlations them rarely addressed. Here, we show that layered an inevitable coupling uniaxial strain shear. Because this, the induces anomalous splitting degenerate shear phonon modes split mode along tensile is not softened but hardened contrary case modes. We confirm effect by measuring Raman shifts bilayer MoS 2 under strain. Moreover, analyzing splitting, obtain unexplored off-diagonal elastic constant, demonstrating spectroscopy can determine almost all constants materials.
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