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Franck-Condon blockade and giant Fano factors in transport through single molecules

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PHYSICAL REVIEW LETTERS
卷 94, 期 20, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.94.206804

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We show that Franck-Condon physics leads to a significant current suppression at low bias voltages (termed Franck-Condon blockade) in transport through single molecules with strong coupling between electronic and vibrational degrees of freedom. Transport in this regime is characterized by remarkably large Fano factors (10(2)-10(3) for realistic parameters), which arise due to avalanchelike transport of electrons. Avalanches occur in a self-similar manner over a wide range of time scales, leading to power-law dependences of the current noise on frequency and vibrational relaxation rate.

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