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TT: Fachverband Tiefe Temperaturen

TT 16: Correlated Electrons: Low-dimensional Systems - Models 2

TT 16.5: Vortrag

Dienstag, 27. März 2012, 10:30–10:45, H 0104

Functional RG for the Anderson Impurity Model — •Michael Kinza¹, Jutta Ortloff², Manuel Schmidt¹, and Carsten Honerkamp¹ — ¹Institut für Theoretische Festkörperphysik, RWTH Aachen University, Deutschland — ²Insititut für Theoretische Physik und Astrophysik, Universität Würzburg, Deutschland

We present a functional Renormalization Group (fRG) approach to the Anderson Impurity model at finite temperatures. Starting with the exact spectral function and interaction vertex of a small system ('core') containing a correlated site, we switch on the hybridization with a non-interacting bath in the RG-flow and calculate spectra of the correlated site. We discuss the emergence of the Kondo-scale in different truncation-levels of the RG-flow-equations and for different choices of the core. Therefore the effective mass and the linear conductance as function of temperature and magnetic field is calculated. Furthermore we discuss an extension of our approach that can describe Anderson-impurities in helical liquids.