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TT: Fachverband Tiefe Temperaturen

TT 19: CE: Quantum Impurities, Kondo Physics

TT 19.2: Talk

Monday, March 14, 2011, 19:00–19:15, HSZ 304

Exact Crossover Green Function In 2-Channel Kondo Effect — •Eran Sela, Andrew Mitchell, and Lars Fritz — Universitaet zu Koeln

The non Fermi liquid critical point of the two-channel Kondo model and related multi impurity models is unstable with respect to symmetry breaking perturbations, which lead to a crossover into Fermi liquid behavior. We use an analogy between this crossover and one occurring in the boundary Ising model to calculate the crossover Green function analytically. In remarkable agreement with our numerical renormalization group calculations, the exact function applies for arbitrary mixture of the relevant perturbations of the critical point such as magnetic field or channel asymmetry, leading to rich behavior which can be observed in quantum dot or tunneling experiments.