Electronic Transport in Fullerene C20 Bridge Assisted by Molecular Vibrations

Details Electronic Transport in Fullerene C20 Bridge Assisted by Molecular Vibrations Electronic Transport in Fullerene C20 Bridge Assisted by Molecular Vibrations

2005-07-23

arxiv.org/abs/cond-mat/0507549v1

Phys. Rev. Lett. 95, 065501 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 4 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.95.065501

The effect of molecular vibrations on electronic transport is investigated with the smallest fullerene C20 bridge, utilizing the Keldysh nonequilibrium Green's function techniques combined with the tight-binding molecular-dynamics method. Large discontinuous steps appear in the differential conductance when the applied bias-voltage matches particular vibrational energies. The magnitude of the step is found to vary considerably with the vibrational mode and to depend on the local electronic states besides the strength of electron-vibration coupling. On the basis of this finding, a novel way to control the molecular motion by adjusting the gate voltage is proposed.

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