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- W2231195286 abstract "We present a theoretical model to describe the double-resonant scattering process in arbitrary carbon nanotubes. We use this approach to investigate the defect-induced $D$ mode in CNTs and unravel the dependence of the $D$-mode frequency on the CNT diameter and on the energy of the resonant optical transition. Our approach is based on the symmetry of the hexagonal lattice and geometric considerations, hence the method is independent of the exact model that is chosen to describe the electronic band structure or the phonon dispersion. We finally clarify the diameter dependence of this Raman mode that was controversely discussed in the past and demonstrate that, depending on the experimental conditions, in general two different dependencies can be measured. We also prove that carbon nanotubes with arbitrary chiral index can exhibit a $D$ mode in their Raman spectrum, in contrast to previous symmetry-based arguments. Furthermore, we give a direct quantification of the curvature-induced phonon frequency corrections of the $D$-mode in carbon nanotubes with respect to graphite." @default.
- W2231195286 created "2016-06-24" @default.
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- W2231195286 date "2015-12-07" @default.
- W2231195286 modified "2023-10-02" @default.
- W2231195286 title "Understanding double-resonant Raman scattering in chiral carbon nanotubes: Diameter and energy dependence of the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>D</mml:mi></mml:math>mode" @default.
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- W2231195286 doi "https://doi.org/10.1103/physrevb.92.235409" @default.
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