We analyze a single-level quantum system placed between metallic leads and strongly coupled to a localized vibrational mode, which models 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 nonequilibrium 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 behavior of the system for different internal parameters such as the electron–vibron and the lead–molecule coupling strength.

Charge-memory effect in a polaron model: Equation-of-motion method for Green functions / D'Amico, Pino; Ryndyk, Dmitry A.; Cuniberti, Gianaurelio; Richter, Klaus. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - 10:(2008), pp. 085002-085013. [10.1088/1367-2630/10/8/085002]

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

D'AMICO, PINO;
2008

Abstract

We analyze a single-level quantum system placed between metallic leads and strongly coupled to a localized vibrational mode, which models 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 nonequilibrium 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 behavior of the system for different internal parameters such as the electron–vibron and the lead–molecule coupling strength.
10
085002
085013
Charge-memory effect in a polaron model: Equation-of-motion method for Green functions / D'Amico, Pino; Ryndyk, Dmitry A.; Cuniberti, Gianaurelio; Richter, Klaus. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - 10:(2008), pp. 085002-085013. [10.1088/1367-2630/10/8/085002]
D'Amico, Pino; Ryndyk, Dmitry A.; Cuniberti, Gianaurelio; Richter, Klaus
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/1077494
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