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

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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.

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Donarini, A., Yar, A. & Grifoni, M. Vibration induced memory effects and switching in ac-driven molecular nanojunctions. Eur. Phys. J. B 85, 316 (2012). https://doi.org/10.1140/epjb/e2012-30407-5

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