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Electron-electron interactions and doping dependence of the two-phonon Raman intensity in graphene
D. M. Basko, S. Piscanec, A. C. Ferrari
Raman spectroscopy is a fast, non-destructive means to characterize graphene samples. In particular, the Raman spectra show a significant dependence on doping. While the change in…
Raman Spectroscopy of Graphene Edges
C. Casiraghi, A. Hartschuh, H. Qian +5
Graphene edges are of particular interest, since their chirality determines the electronic properties. Here we present a detailed Raman investigation of graphene flakes with well d…
Temperature dependent phonon renormalization in metallic nanotubes
V. Scardaci, S. Piscanec, Michele Lazzeri +3
We measure the temperature dependence of the Raman spectra of metallic and semiconducting nanotubes. We show that the different trend in metallic tubes is due to phonon re-normaliz…
Edge-functionalized and substitutional doped graphene nanoribbons: electronic and spin properties
F. Cervantes-Sodi, G. Csányi, S. Piscanec +1
Graphene nanoribbons are the counterpart of carbon nanotubes in graphene-based nanoelectronics. We investigate the electronic properties of chemically modified ribbons by means of…
Electrochemically Top Gated Graphene: Monitoring Dopants by Raman Scattering
A. Das, S. Pisana, S. Piscanec +8
We demonstrate electrochemical top gating of graphene by using a solid polymer electrolyte. This allows to reach much higher electron and hole doping than standard back gating. In-…
Optical Phonons in Carbon Nanotubes: Kohn Anomalies, Peierls Distortions and Dynamic Effects
Stefano Piscanec, Michele Lazzeri, John Robertson +2
We present a detailed study of the vibrational properties of Single Wall Carbon Nanotubes (SWNTs). The phonon dispersions of SWNTs are strongly shaped by the effects of electron-ph…