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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.7: Poster

Thursday, February 28, 2008, 14:00–18:00, Poster B

Functional Renormalization Group Approach to a Single-Level QuantumDot in Non-Equilibrium — •Andreas Dirks, Riccardo Gezzi, and Thomas Pruschke — Institut für Theoretische Physik der UniversitätGöttingen

Properties of a recently proposed [1] functional RG approach to non-equilibrium quantum many-particle systems are being discussed with respect to its suitability to describe transport through a single-level quantum dot beyond linear-response theory. Compared to previous calculations, the full energy-dependence of the irreducible vertex functions is preserved in the RG flow in order to obtain more accurate results for transport properties as function of applied bias, gate voltage and temperature. As nice side effect we avoid an analytical continuation procedure necessary for standard imaginary time approaches.

[1] R. Gezzi, Th. Pruschke, and V. Meden, Phys. Rev. B 75, 045324 (2007)