Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 17: Postersitzung II: Transport, Quantenkoh
ärenz, Quantenflüssigkeiten

TT 17.15: Poster

Dienstag, 9. März 2004, 14:30–19:00, Poster A

Conductance fluctuations in nonequilibrium — •Thomas Ludwig^1,2, Alexander Mirlin^1,2, and Yaroslav Blanter³ — ¹Institut für Nanotechnologie, Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany — ²Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, 76128 Karlsruhe, Germany — ³Department of NanoScience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands

We investigate the amplitude of mesoscopic fluctuations of the differential conductance of a metallic wire at arbitrary bias voltage. We identify the parameter regime where inelastic scattering is important. In the noninteracting case we show quantitative results for T=0, in the interacting case we qualitatively identify the asymptotic behaviour. We show that, due to inelastic scattering, conductance fluctuations cannot grow with increasing voltage in a way that would lead to negative differential resistance.