Berlin 2012 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 45: Correlated Electrons: Poster Session
TT 45.20: Poster
Donnerstag, 29. März 2012, 15:00–19:00, Poster B
Out-of-equilibrium steady state properties of the Bose-Fermi Kondo model — •Pedro Ribeiro and Stefan Kirchner — Max-Planck-Institute for the Physics of Complex Systems
We study the out-of-equilibrium steady state properties of the Bose Fermi Kondo describing a local magnetic moment coupled to two leads supporting bosonic and fermionic low energy excitations. The model describes a single-electron transistor with ferromagnetic leads where the magnetization of the two leads is taken to be antiparallel and the effective magnetic field seen by the local impurity vanishes. In such setup, a Kondo peak in the differential conductance can be observed in the Coulomb-blockade regime. The Bose Fermi Kondo captures the essential physical picture as the Kondo effect is critically destroyed upon increasing the coupling to the magnons in the leads. We explore the different regimes of this model using a dynamical large-N approach and study the response functions when a finite bias voltage or a temperature gradient is imposed across the leads. We report the existence of an effective temperature Teff and show that the local susceptibility, as a function of Teff follows the equilibrium scaling form. We also address the electric and thermal current response.