Thursday, May 22, 2008, 1:30 pm — Small Seminar Room, Bldg. 510
Because carbon nanotubes are considered model one- dimensional systems, their electronic transport is strongly affected by electron-electron (e-e) interactions. Measurements of the non-equilibrium electron energy distribution function in nanotubes may directly determine electron energy relaxation rates, which may also tell us e-e scattering rates and therefore something about e-e interactions in nanotubes. I will describe such measurements using tunneling spectroscopy to probe the shape of the local energy distribution in nanotubes that have bias voltages applied between their ends to drive the electrons out of equilibrium. We find that, at tens of mK, electrons interact weakly in nanotubes of a few microns channel length. Surprisingly, the energy relaxation rate sometimes grows substantially when the temperature is raised to only 1.5 K.
Hosted by: Igor Zaliznyak
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