Regensburg 2004 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 5: Transporteigenschaften
HL 5.2: Vortrag
Montag, 8. März 2004, 10:30–10:45, H14
Phonon-assisted Transport through Stacks of Quantum Dots — •C. Gnodtke1, G. Kiesslich1, A. Wacker1,2, and E. Schöll1 — 1Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin — 2Department of Physics, University of Lund, Box 118, SE-22100 Lund, Sweden
A fully self-consistent theory based on nonequilibrium Green’s functions is used to calculate the stationary properties of a system of coupled quantum dots under the influence of phonon scattering. The current-voltage characteristic is computed, revealing peaks due to phonon-absorption and emission processes. The dependence of these peaks on the coupling of the dots to contacts and the interdot coupling are studied in detail, showing a particularly strong sensitivity to the coupling between the dots. A comparison with a simplified model for the scattering processes, i.e. diagonal self-energies, shows that this tends to overestimate the phonon-assisted tunneling contributions to the overall current.