1. Graphene phonon softening and splitting by directional straining.
- Author
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Yang, X. X., Wang, Y., Li, J. W., Liao, W. H., Liu, Y. H., and Sun, Chang Q.
- Subjects
GRAPHENE ,CARBON ,PHONON softening ,CARBON products manufacturing ,CARBON foams - Abstract
Strain-induced graphene phonon softening and phonon band splitting are indeed fascinating, which were attributed to the phonon double resonant scattering without intrinsic involvement of C-C bond relaxation. Here, we show that the lengthening and weakening of the C-C bond softens the phonon and that the mismatching between the uniaxial strain and the C
3v bond geometry splits the band. In addition to the force constant of 11.8 N/m for a C-C bond in graphene, consistency between theory and measurements derives that if the strain is along a bond, maximal band splitting happens; if the strain is perpendicular, no band splitting occurs. [ABSTRACT FROM AUTHOR]- Published
- 2015
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