Alternative functional renormalization group approach to the single impurity Anderson model

Michael Kinza, Jutta Ortloff, Johannes Bauer, Carsten Honerkamp
2013 Physical Review B  
We present an alternative functional renormalization group (fRG) approach to the single-impurity Anderson model at finite temperatures. Starting with the exact self-energy and interaction vertex of a small system ('core') containing a correlated site, we switch on the hybridization with a non-interacting bath in the fRG-flow and calculate spectra of the correlated site. Different truncations of the RG-flow-equations and choices of the core are compared and discussed. Furthermore we calculate
more » ... linear conductance and the magnetic susceptibility as functions of temperature and interaction strength. The signatures of Kondo physics arising in the flow are compared with numerical renormalization group results.
doi:10.1103/physrevb.87.035111 fatcat:rp6rspehwngxdoqszo7n4zdoju