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125. 


Charge-memory effect in a polaron model: equation-of-motion method for Green functions



P. D'Amico, D. A. Ryndyk, G. Cuniberti, and K. Richter

New Journal of Physics 10, 085002 (2008)

We analyze a single-level quantum system placed between metallic leads and strongly coupled to a localized vibrational mode, which models a singlemolecule junction or an STM setup. We consider a polaron model describing the interaction between electronic and vibronic degrees of freedom and develop and examine different truncation schemes in the equation-of-motion method within the framework of non-equilibrium Green functions. We show that upon applying gate or bias voltage, it is possible to observe charge-bistability and hysteretic behavior which can be the basis of a charge-memory element. We further perform a systematic analysis of the bistability behaviour of the system for different internal parameters such as the electron-vibron and the lead-molecule coupling strength.



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doi absolute link10.1088/1367-2630/10/8/085002
online abstract at the publisher site
publisher site (ISSN:1367-2630)
online abstractarXiv preprint: 0806.1633
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