The influence of thermal fluctuations on the electronic transport of alkeno-thiolates

In this paper, we investigate the influence of molecular vibrations on the tunneling of electrons through alkeno-thiolates of varying lengths sandwiched in between two gold contacts. The study is confined to the elastic scattering. The vibrational modes are treated quantum-mechanically and the tunne...

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Bibliographic Details
Published in:IEEE transactions on nanotechnology 2004-09, Vol.3 (3), p.353-357
Main Authors: Pecchia, A., Gheorghe, M., Latessa, L., Di Carlo, A., Lugli, P.
Format: Article
Language:English
Subjects:
Applied sciences
Approximation
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Density
Distributed computing
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in mesoscopic systems
Electronics
Electrons
Exact sciences and technology
Fluctuation
Fluctuations
Gold
Mathematical analysis
Molecular electronics, nanoelectronics
Oscillators
Particle scattering
Physics
Quantum computing
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Temperature
Tunneling
Vibration
Vibrations
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Summary:In this paper, we investigate the influence of molecular vibrations on the tunneling of electrons through alkeno-thiolates of varying lengths sandwiched in between two gold contacts. The study is confined to the elastic scattering. The vibrational modes are treated quantum-mechanically and the tunneling current is computed as an ensemble average over the distribution of the atomic configurations, obtained by a suitable approximation of the density matrix for the normal mode oscillators. The quantum-mechanical treatment is necessary in order to correctly include the zero-point fluctuations. The calculations show no temperature dependence for the tunneling current in the regime between 270-350 K.
ISSN:1536-125X
1941-0085
DOI:10.1109/TNANO.2004.828573