Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 40: Poster Session Correlated Electrons
TT 40.3: Poster
Mittwoch, 13. März 2013, 15:00–19:00, Poster D
Time Dynamics of the Two-Impurity Kondo Model — •Benedikt Lechtenberg and Frithjof B. Anders — Technische Universität Dortmund, Lehrstuhl für Theoretische Physik II, 44221 Dortmund, Germany
The equilibrium properties of various two-impurity Kondo models (TIKM) have been investigated extensively in the literature. We study the non-equilibrium dynamics of the TIKM employing the time-dependent numerical renormalization-group (TD-NRG). The TD-NRG was developed to treat the real-time dynamics of quantum-impurity systems. We are interested in the real-time response of the the second spin S2→ as a function of the initial condition of the first spin S1→ and their distance R. We determine the relevant time scale and relaxation rates. The particle-hole symmetric model exhibits a quantum phase transition at a critical anti-ferromagnetic coupling. We investigate the change in the dynamics as function of the coupling constant close to QPT.