Prof. Francesco Mauri (Université Pierre et Marie Curie, Paris), 27 Feb. 2008, ore 15:00, Aula 131, Ed. C.
Abstract: Metallic carbon nanotubes can carry the highest current density before they break. This makes them the best candidates as interconnects in future electronic devices. For voltages > 0.2 V, the measured IV curve of metallic tubes displays a sudden increase of the resistivity which is due to the scattering with optical phonons. Recently, we have shown [1,2] that the largest part of this electrical resisitivity is due to the presence of an anomalously-high optical-phonon occupation (hot phonons). Indeed, during transport, the conducting electrons scatter with optical phonons.