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Abstract:
The electronic and vibrational density of states of a semiconducting
carbon nanotube in a crossed junction was investigated by elastic and
inelastic scanning tunneling spectroscopy. The strong radial
compression of the nanotube at the junction induces local metallization
spatially confined to a few nanometers. The local electronic
modifications are correlated with the observed changes in the radial
breathing and G band phonon modes, which react very sensitively to
local mechanical deformation. In addition, the experiments reveal the
crucial contribution of the image charges to the contact potential at
nanotube-metal interfaces.
