Berlin 2005 – scientific programme
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TT: Tiefe Temperaturen
TT 33: Transport - Nanoelectronics III: Molecular Electronics
TT 33.12: Talk
Tuesday, March 8, 2005, 17:00–17:15, TU H3027
Franck-Condon blockade and giant Fano factors in transport through single molecules — •Jens Koch and Felix von Oppen — Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin
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.
For weak vibrational relaxation, we find that transport in this regime is characterized by remarkably large Fano factors (102–103), which arise due to avalanche-like transport of electrons. Avalanches occur in a self-similar manner over a wide range of time scales, as reflected in power-law dependences of the current noise on frequency and vibrational relaxation rate.