Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.26: Poster

Montag, 26. März 2012, 15:00–19:00, Poster B

Statistical model for the effects of phase and momentum randomization on electron transport — •Thomas Stegmann¹, Matías Zilly¹, Orsolya Ujsághy², and Dietrich E. Wolf¹ — ¹Department of Physics, University of Duisburg-Essen and CeNIDE, Duisburg, Germany — ²Department of Theoretical Physics and Condensed Matter Research Group of the Hungarian Academy of Sciences, Budapest University of Technology and Economics, Budapest, Hungary

Recently, we have introduced a statistical model for the effects of dephasing on the transport properties of large systems [1]. This model has been applied successfully on the conduction of DNA molecules [2] and the dephasing-induced conductivity in the 1D Anderson model [3]. Now, we present an extension of our model which allows to adjust the degree of phase and momentum randomization independently.

As a first result, we demonstrate that the resistance of an ordered tight-binding chain is independent of the chain length and the degree of phase randomization if the dephasing is momentum conserving. In contrast, the resistance increases if the dephasing is momentum randomizing.
M. Zilly, O. Ujsághy and D. E. Wolf, Eur. Phys. B, 68:237 (2009)
M. Zilly, O. Ujsághy and D. E. Wolf, Phys. Rev. B, 82:125125 (2010)
M. Zilly, O. Ujsághy, M. Wölki and D. E. Wolf, Phys. Rev. B, arXiv:1111.6014