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We analyze the spectral function of the single-impurity two-terminal Andersonmodel at finite voltage using the recently developed diagrammatic quantum MonteCarlo technique as well as perturbation theory. In the(particle-hole-)symmetric case we find an excellent agreement of the numericaldata with the perturbative results of second order up to interaction strengths$U/\Gamma \approx 2$, where $\Gamma$ is the transparency of theimpurity-electrode interface. The analytical results are obtained in form ofthe nonequilibrium self-energy for which we present explicit formulas in theclosed form at arbitrary bias voltage. We observe an increase of the spectraldensity around zero energy brought about by the Kondo effect. Our analysissuggests that a finite applied voltage $V$ acts as an effective temperature ofthe system. We conclude that at voltages significantly larger than theequilibrium Kondo temperature there is a complete suppression of the Kondoeffect and no resonance splitting can be observed. We confirm this scenario bycomparison of the numerical data with the perturbative results.

Anderson impurity model in nonequilibrium: analytical results versus quantum Monte Carlo data