D'Amico, Pino and Ryndyk, Dmitry and Cuniberti, Gianaurelio and Richter, Klaus (2008) Charge-memory effect in a polaron model: equation-of-motion method for Green functions. New Journal of Physics 10, 085002-1 - 085002-12.
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We analyze a single-level quantum system placed between metallic leads and strongly coupled to a localized vibrational mode, which can be thought as a model for a single-molecule 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 gating the structure with an external 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
|Institutions:||Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter|
|Projects:||SFB 689: Spinphänomene in reduzierten Dimensionen, SPP 1243: Quantum transport at the molecular scale|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||25 May 2009 13:18|
|Last Modified:||05 Aug 2009 13:57|