Marcel Mohr

Phonon dispersion of graphite by inelastic x-ray scattering

We present the full in-plane phonon dispersion of graphite obtained from inelastic x-ray scattering, including the optical and acoustic branches, as well as the mid-frequency range between the

Raman 2D-Band Splitting in Graphene: Theory and Experiment

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Splitting of the Raman 2D band of graphene subjected to strain

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Two-dimensional electronic and vibrational band structure of uniaxially strained graphene from ab initio calculations

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Symmetry properties of vibrational modes in graphene nanoribbons

points in the Brillouin zone, where experimental data have been unavailable so far. The existence of a Kohn anomaly at the

ELECTRON-PHONON COUPLING IN GRAPHENE

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Elasticity of single-crystalline graphite: Inelastic x-ray scattering study

point is further supported. We fit a fifth-nearest neighbour force-constants model to the experimental data, making improved force-constants calculations of the phonon dispersion in both graphite and carbon nanotubes available.

Vibrational properties of graphene nanoribbons by first-principles calculations

We present a systematic experimental and theoretical study of the two-phonon (2D) Raman scattering in graphene under uniaxial tension. The external perturbation unveils that the 2D mode excited with 785 nm has a complex line-shape mainly due to the contribution of two distinct double resonance scattering processes (inner and outer) in the Raman signal. The splitting depends on the direction of the applied strain and the polarization of the incident light. The results give new insight into the nature of the 2D band and have significant implications for the use of graphene as reinforcement in composites since the 2D mode is crucial to assess how effectively graphene uptakes an applied stress or strain.

Direct observation of the radial breathing mode in CdSe nanorods.

The Raman

Optical phonons in colloidal CdSe nanorods

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