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Vibration induced memory effects and switching in ac-driven molecular nanojunctions

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  • A. Donarini
  • A. Yar
  • M. Grifoni

Abstract

We investigate bistability and memory effects in a molecular junction weakly coupled to metallic leads with the latter being subject to an adiabatic periodic change of the bias voltage. The system is described by a simple Anderson-Holstein model and its dynamics is calculated via a master equation approach. The controlled electrical switching between the many-body states of the system is achieved due to polaron shift and Franck-Condon blockade in the presence of strong electron-vibron interaction. 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. In general, both the occupation probabilities of the vibronic states and the associated vibron energy show hysteretic behaviour for driving frequencies in a range set by the minimum and maximum lifetimes of the system. The consequences on the transport properties for various driving frequencies and in the limit of DC-bias are also investigated. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Suggested Citation

  • A. Donarini & A. Yar & M. Grifoni, 2012. "Vibration induced memory effects and switching in ac-driven molecular nanojunctions," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 85(9), pages 1-14, September.
    • Handle: RePEc:spr:eurphb:v:85:y:2012:i:9:p:1-14:10.1140/epjb/e2012-30407-5
    DOI: 10.1140/epjb/e2012-30407-5
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    Mesoscopic and Nanoscale Systems;

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