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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…
Probing the doping in metallic and semiconducting carbon nanotubes by Raman and transport measurements
Anindya Das, A. K. Sood, A. Govindaraj +4
In-situ Raman experiments together with transport measurements have been carried out on carbon nanotubes as a function of gate voltage. In metallic tubes, a large increase in the R…
Phonon anharmonicities in graphite and graphene
Nicola Bonini, Michele Lazzeri, Nicola Marzari +1
We determine from first-principles the finite-temperature properties--linewidths, line shifts, and lifetimes--of the key vibrational modes that dominate inelastic losses in graphit…
Anharmonic effects in MgB2? A comparative inelastic X-ray scattering and Raman study
Matteo d'Astuto, Matteo Calandra, Stephanie Reich +7
We study anharmonic effects in MgB2 by comparing Inelastic X-ray and Ramanscattering together with ab-initio calculations. Using high statistics and high q resolution measurements…
Kohn anomalies and non-adiabaticity in doped carbon nanotubes
Nicolas Caudal, A. Marco Saitta, Michele Lazzeri +1
The high-frequency Raman-active phonon modes of metallic single-walled carbon nanotubes (SWNTs) are thought to be characterized by Kohn anomalies (KAs), which are expected to be mo…