Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 9: Transport: Nanoelectronics III - Molecular Electronics
TT 9.9: Vortrag
Montag, 27. März 2006, 16:15–16:30, HSZ 304
Electron-vibration interactions in transport through atomic gold wires — •Janne Viljas1, Juan-Carlos Cuevas1,2,3, Fabian Pauly1, and Michael Häfner1 — 1Institut für Theoretische Festkörperphysik, Universität Karlsruhe, Germany — 2Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Spain — 3Forschungszentrum Karlsruhe, Institut für Nanotechnologie
The effect of electron-vibration coupling on the conduction through molecular-scale conductors has recently gained considerable attention. Atomic wires formed in metallic point contacts are very simple examples of "molecular" conductors, and are ideal test systems for understanding inelastic transport at the molecular scale. Making use of tight-binding models, we describe the influence of electron-vibration processes on the conductance-voltage characteristic of atomic gold wires [1]. The signature of the excitation of vibrations is usually a series of downward steps. We study systematically how the step heights and voltage positions vary under stretching of wires with varying numbers of atoms, and find a good overall agreement with recent experiments [2].
[1] J. K. Viljas et al., cond-mat/0508470.
[2] N. Agraït et al., Phys. Rev. Lett. 88, 216803 (2002).