Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.16: Poster

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

Multiply Connected Graph Model for Dephasing in Diffusive Quantum Dots — •Maximilian Treiber, Oleg Yevtushenko, and Jan von Delft — Ludwig Maximilians Universität, Arnold Sommerfeld Center und Center for Nano-Science, München

We propose a model, based on the theory of diffusion in graphs, to study quantum transport through a diffusive quantum dot. The graph consists of a central region composed of many quasi-1d wires describing the dot, and two identical left- and right- wires connected to leads describing contacts. We evaluate the conductance for this model and compare our results to random matrix theory (RMT). An advantage compared to RMT-models is that we can take into account interaction- induced dephasing at finite temperatures. We present results for the temperature dependence of the weak localization correction and discuss the possibility to observe the elusive 0D-regime of dephasing in quantum dots.