Tunnel current through a redox molecule coupled to classical phonon modes in the strong tunneling limit
| Autor: | I. G. Medvedev |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Physics
Valence (chemistry) Condensed matter physics Phonon Scanning tunneling spectroscopy Spectral density Biasing Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Potential energy Electronic Optical and Magnetic Materials law.invention law Condensed Matter::Superconductivity Atomic physics Scanning tunneling microscope Quantum tunnelling |
| Zdroj: | Physical Review B. 76 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.76.125312 |
| Popis: | The tunnel current through a redox molecule coupled to classical phonon modes is calculated in the strong tunneling limit in the Born-Oppenhiemer approximation. The effective ``potential energy'' of the phonon modes is introduced in the steady state of the in situ scanning tunneling microscope system. The expression for the tunnel current is obtained by using thermal averaging over this potential energy calculated within the spinless model in the wideband approximation. The dependence of the tunnel current on the width of the valence level of the redox molecule, the bias voltage, and the overvoltage is studied and discussed. The results of calculations of the tunnel current and the spectral density are used for interpretation of the experimental data obtained by Tao [Phys. Rev. Lett. 76, 4066 (1996)] and Visoly-Fisher et al. [Proc. Natt. Acad. Sci. U.S.A. 103, 8686 (2006)]. |
| Databáze: | OpenAIRE |
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