Finite-frequency noise properties of the nonequilibrium Anderson impurity model

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 fora pe...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-09, Vol.86 (12), Article 125324
Main Authors: Orth, Christoph P., Urban, Daniel F., Komnik, Andreas
Format: Article
Language:English
Subjects:
Autocorrelation functions
Condensed matter
Electric potential
Impurities
Mathematical analysis
Noise
Perturbation methods
Voltage
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Summary: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 fora 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 Kendo temperature instead of the voltage.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.86.125324