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Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 111: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 111.7: Vortrag

Freitag, 20. März 2015, 11:15–11:30, H 3005

From the weak coupling regime to the Kondo crossover within the reduced density matrix framework — •Davide Mantelli and milena grifoni — Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Deutschland

When an Anderson quantum impurity is coupled to non interacting leads, many different regimes are accessible. In the weak coupling regime Γ≪ kBT,U (with Γ the tunnelling coupling, T the temperature and U the charging energy), Coulomb blockade and co-tunnelling phenomena are well described within a perturbative approach in Γ. However, as the thermal energy approaches the coupling one, the perturbative method breaks down. By summing up a series of charge fluctuations events to all order in Γ we managed to reach the intermediate regime (Γ≃ kBT) within the so-called “Dressed Second Order” (DSO)[1]. Considering its natural extension, the “Dressed-DSO”, we achieved to describe the Kondo crossover where the thermal energy is comparable to the Kondo one (TTK). In this regime, equilibrium and non equilibrium fingerprints of the Kondo physics are carefully analysed.


[1] J. Kern and M. Grifoni, Eur. Phys. J. B 86, 384 (2013)

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