Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 26: Transport - Poster Session

TT 26.9: Poster

Mittwoch, 29. März 2006, 14:30–18:30, P1

Dephasing by transverse gauge field fluctuations — •Thomas Ludwig¹ and Alexander D. Mirlin^1,2 — ¹Institut fuer Nanotechnologie, Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany — ²Institut fuer Theorie der Kondensierten Materie, Universitaet Karlsruhe, 76128 Karlsruhe, Germany

We consider the effect of transverse gauge field fluctuations on quantum interference effects in lowdimensional disordered systems. Using a purely diffusive description we reproduce a logarithmic correction to the dephasing rate of the Cooperon in two dimensions first found by Wölfle (2000). In addition, we present new results for the wire geometry where we find a dephasing rate linear in the temperature. Finally, we examine the difference between the dephasing rate due to slow gauge field fluctuations (with frequencies smaller than the dephasing rate) and the dephasing rate due to fast fluctuations (with frequencies larger than the dephasing rate).