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

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 di...

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Bibliographic Details
Published in:The European physical journal. B, Condensed matter physics Condensed matter physics, 2009-03, Vol.68 (2), p.237-246
Main Authors: Zilly, M., Ujsághy, O., Wolf, D. E.
Format: Article
Language:English
Subjects:
Complex Systems
Condensed Matter Physics
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic transport in condensed matter
Exact sciences and technology
Fluid- and Aerodynamics
General formulation of transport theory
Mesoscopic and Nanoscale Systems
Physics
Physics and Astronomy
Solid State Physics
Theory of electronic transport
scattering mechanisms
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Summary: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.
ISSN:1434-6028
1434-6036
DOI:10.1140/epjb/e2009-00101-0