Regensburg 2010 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 6: Poster Session I
DY 6.43: Poster
Montag, 22. März 2010, 16:00–18:00, Poster B2
Diffusion in a finite, non-isotropic Anderson model — •Hendrik Niemeyer1 and Robin Steinigeweg2 — 1University of Osnabrueck, Physics Departement, Germany — 2University of Braunschweig, Physics Departement, Germany
We investigate the existence of diffusive dynamics at various wavelengths in a single-particle 3D Anderson model by solving the full time-dependent Schroedinger equation. This model features a coarse-grained structure: The lattice is divided into layers and the hoppings between layers differ from the hoppings within the layers. Criterions for the transport behaviour of the system are introduced by analyzing the time evolution of the expectation value of the Fourier components of the spatial particle density. We come to the conclusion that a diffusive corridor w.r.t. wavelengths exists featuring the same diffusion constant for every energy interval. This confirms results from the time-convolutionless projection operator technique applied to the same model.