Local pressure-induced metallization of a semiconducting carbon nanotube in a crossed junction

Physics – Condensed Matter – Materials Science

Scientific paper

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Scientific paper

10.1103/PhysRevLett.96.086804

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 nm. 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.

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