Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 47: TR: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 1
TT 47.6: Talk
Thursday, March 17, 2011, 12:00–12:15, HSZ 304
Anderson impurity model in nonequilibrium: analytical results versus quantum Monte Carlo data — Lothar Mühlbacher1, •Daniel F. Urban1, and Andreas Komnik2 — 1Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, D-79104 Freiburg, Germany — 2Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, D-69120 Heidelberg, Germany
We analyze the spectral function of the single-impurity two-terminal Anderson model at finite voltage using the recently developed diagrammatic quantum Monte Carlo technique as well as perturbation theory. In the (particle-hole-)symmetric case we find an excellent agreement of the numerical data with the perturbative results of second order up to interaction strengths U/Γ ≈ 2, where Γ is the transparency of the impurity-electrode interface. The analytical results are obtained in form of the nonequilibrium self-energy for which we present explicit formulas in the closed form at arbitrary bias voltage. We observe an increase of the spectral density around zero energy brought about by the Kondo effect. Our analysis suggests that a finite applied voltage V acts as an effective temperature of the system. We conclude that at voltages significantly larger than the equilibrium Kondo temperature there is a complete suppression of the Kondo effect and no resonance splitting can be observed. We confirm this scenario by comparison of the numerical data with the perturbative results.
[1] L. Mühlbacher, D. F. Urban, and A. Komnik, arXiv:1007.1793.