Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 7: Correlated Electrons - (General) Theory II

TT 7.5: Vortrag

Freitag, 4. März 2005, 17:45–18:00, TU H2053

Non-Equilibrium Scaling Analysis of the Kondo Model with Voltage Bias — •Stefan Kehrein — Theoretische Physik III - Elektronische Korrelationen und Magnetismus, Institut für Physik, Universität Augsburg

We study the scaling equations for the Kondo model with voltage bias. We discuss how their structure changes from the well-known equilibrium form to the non-equilibrium situation for nonzero voltage bias. Our analysis is done using the flow equation method (infinitesimal unitary transformation method) that makes the many-body Hamiltonian increasingly more energy-diagonal (cond-mat/0410341). In particular, it becomes apparent that the conventional expansion of the scaling equations in powers of the running coupling constant needs to be reconsidered carefully in non-equilibrium. Our observations should be of general importance for deriving the scaling flow of similar non-equilibrium quantum many-body problems.