Transport in tight-binding bond percolation models

Autor(en): Schmidtke, Daniel
Khodja, Abdellah
Gemmer, Jochen 
Stichwörter: DYNAMICS; Physics; Physics, Fluids & Plasmas; Physics, Mathematical; QUANTUM PERCOLATION
Erscheinungsdatum: 2014
Herausgeber: AMER PHYSICAL SOC
Journal: PHYSICAL REVIEW E
Volumen: 90
Ausgabe: 3
Zusammenfassung: 
Most of the investigations to date on tight-binding, quantum percolation models focused on the quantum percolation threshold, i.e., the analog to the Anderson transition. It appears to occur if roughly 30% of the hopping terms are actually present. Thus, models in the delocalized regime may still be substantially disordered, hence analyzing their transport properties is a nontrivial task which we pursue in the paper at hand. Using a method based on quantum typicality to numerically perform linear response theory we find that conductivity and mean free paths are in good accord with results from very simple heuristic considerations. Furthermore we find that depending on the percentage of actually present hopping terms, the transport properties may or may not be described by a Drude model. An investigation of the Einstein relation is also presented.
ISSN: 15393755
DOI: 10.1103/PhysRevE.90.032127

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