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TT: Fachverband Tiefe Temperaturen
TT 73: Fluctuations and Noise
TT 73.2: Talk
Friday, March 15, 2013, 12:00–12:15, H20
Finite-frequency noise properties of the nonequilibrium Anderson impurity model — •Christoph P. Orth1, Andreas Komnik2, and Daniel F. Urban3 — 1University of Basel, Switzerland — 2University of Heidelberg, Germany — 3University of Freiburg, Germany
We analyze the spectrum of the electric-current autocorrelation function (noise power) in the Anderson impurity model biased by a finite transport voltage. Special emphasis is placed on the interplay of nonequilibrium effects and electron-electron interactions. Analytic results are presented for a perturbation expansion in the interaction strength U . Compared to the noninteracting setup we find a suppression of noise for finite frequencies in equilibrium and an amplification in nonequilibrium. Furthermore, we use a diagrammatic resummation scheme to obtain nonperturbative results in the regime of intermediate U. At finite voltage, the noise spectrum shows sharp peaks at positions related to the Kondo temperature instead of the voltage.