Zilly, Matias; Ujsághy, Orsolya; Wolf, Dietrich:

Statistical model for the effects of dephasing on transport properties of large samples

In: European physical journal / B, Jg. 68 (2009) ; Nr. 2, S. 237-246
ISSN: 1434-6036
Zeitschriftenaufsatz / Fach: Physik
Zentrale wissenschaftliche Einrichtungen » Center for Nanointegration Duisburg-Essen (CeNIDE)
We present a statistical model for the effects of dephasing on the transport properties of large
devices. The physical picture is different from earlier models which assume that dephasing happens continuously
throughout the sample, whereas we model the dephasing in a statistical sense, assuming a distribution
of completely phase randomizing regions between which the transport is coherent and described by the
nonequilibrium Green’s function method. Thus the sample is effectively divided into smaller parts making
the numerical treatment more efficient. As a first application the conductances of ordered and disordered
linear tight-binding chains are calculated and compared to the results of other phenomenological models
in the literature.