Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.32: Poster

Montag, 26. März 2012, 15:00–19:00, Poster B

Vibration induced memory effects in molecular nanojunctions — •Abdullah Yar, Andrea Donarini, and Milena Grifoni — Institute for Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany

We investigate the bistability and memory effects for a single molecule weakly coupled to metallic leads subject to time-dependent voltage. The system is described by an Anderson-Holstein model and its dynamics is calculated via a master equation approach. Particular emphasis is given to the role played by the excited vibronic states in the bistability and hysteretic switching dynamics as a function of the voltage sweeping rates. We discuss how the hysteretic behavior depends on the asymmetry of the voltage drop through the junction as well as on the time scales of voltage sweeping and quantum switching rates between metastable states.