Local pressure-induced metallization of a semiconducting carbon nanotube in a crossed junction |
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Authors: | Vitali L Burghard M Wahl P Schneider M A Kern K |
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Affiliation: | Max-Planck-Institut für Festk?rperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany. |
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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. |
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