Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.22: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Real-Time Dynamics in Bose-Fermi Impurity Models — •Christian Kleine and Frithjof B. Anders — Technische Universität Dortmund, Lehrstuhl für Theoretische Physik II, 44221 Dortmund

We consider the real-time dynamics in a nano-device coupled to a fermionic lead and subject to additional charge noise or coupling to a phononic bath. We have extended the recently adopted numerical renormalisation group (NRG) to Bose-Fermi models in equilibrium to non-equilibrium quenches by employing the time-dependent NRG. It is known that such Bose-Fermi models show very rich physics in equilibrium manifested in a variety of different fixed points governing the phase transitions between different ground states. We present relaxation rates of different physical properties such as the local occupancy or spin polarisation across the quantum phase transition between the localised/delocalised phases in the Bose-Fermi Kondo model as well as in the more general Bose-Fermi Anderson model.