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TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 37.4: Vortrag

Freitag, 29. Februar 2008, 11:00–11:15, H 2053

Non-Equilibrium Scaling 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

By using infinitesimal unitary transformations (flow equations) [1] we derive a perturbative scaling picture of a Kondo dot in a magnetic field. Within this single scaling picture we are able to study both equilibrium and non-equlibrium (dc voltage bias) situations. As main result, we work out the spin-spin correlation function and the T-Matrix as functions of magnetic field, voltage bias and temperature.

This work is a generalization of the previous flow equation analysis of the non-equilibrium Kondo Model [2].

[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)