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TT: Fachverband Tiefe Temperaturen

TT 46: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 46.6: Talk

Friday, March 27, 2009, 11:45–12:00, HSZ 301

Flow Equation Analysis of a Kondo Dot in a Magnetic Field — •Peter Fritsch and Stefan Kehrein — Physics Department, ASC, and CeNS, Ludwig-Maximilians-Universität, Theresienstrasse 37, 80333 Munich, Germany

Using infinitesimal unitary transformations (flow equations) [1,2] we derive a consistent perturbative scaling picture of a Kondo dot in a magnetic field for both equilibrium and non-equilibrium (dc voltage bias) situations. We work out the spin dynamics and the T-Matrix as functions of magnetic field, voltage bias and temperature. In particular, we report on the behavior of both the static spin susceptibility [3] and the magnetization including leading logarithmic corrections. This work is a generalization of the previous flow equation analysis of the non-equilibrium Kondo model in zero magnetic field [1,2,3].

[1] S. Kehrein, The Flow Equation Approach to Many-Particle Systems, Springer Tracts in Modern Physics 217

[2] S. Kehrein, Phys. Rev. Lett. 95, 056602 (2005)

[3] P. Fritsch and S. Kehrein, arxiv:0811.0759