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

Transition from coherent to ohmic conductance explained by a statistical model for the effects of decoherence

In: MRS Online Proceedings Library, Jg. 2010 (2010) ; Nr. 1260, S. 1260-T12-02
ISSN: 1946-4274
Zeitschriftenaufsatz / Fach: Physik
Abstract:
Using a statistical model for the effects of decoherence [1], we show that in linear tight-binding samples ohmic conductance (resistance proportional to length) is reached for any finite density p of decoherence sites, if the chemical potential μ of the contacts is within a conducting band. If μ is outside a band, or if due to disorder, no bands form, for high decoherence densities p>p* still ohmic conductance is reached, where p* is a critical decoherence density. For p<p*, the sample resistance increases exponentially with the length