Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 72: Transport: Molecular Electronics II

TT 72.3: Vortrag

Mittwoch, 2. April 2014, 15:30–15:45, HSZ 304

Localization under the effect of randomly distributed decoherence — •Thomas Stegmann¹, Orsolya Ujsághy², and Dietrich E. Wolf¹ — ¹Department of Physics and CENIDE, University of Duisburg-Essen, Germany — ²Department of Theoretical Physics, Budapest University of Technology and Economics, Hungary

Electron transport through disordered quasi one-dimensional quantum systems is studied. Decoherence is taken into account by a spatial distribution of virtual reservoirs, which represent local interactions of the conduction electrons with their environment.

We show that the decoherence distribution has observable effects on the transport. If the decoherence reservoirs are distributed randomly without spatial correlations, a minimal degree of decoherence is necessary to obtain Ohmic conduction. Below this threshold the system is localized and thus, a decoherence driven metal-insulator transition is found. In contrast, for homogenously distributed decoherence, any finite degree of decoherence is sufficient to destroy localization. Thus, the presence or absence of localization in a disordered one-dimensional system may give important insight about how the electron phase is randomized.
arXiv:1308.4328