Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 15: Correlated Electrons: Quantum Impurities, Kondo Physics 1

TT 15.2: Vortrag

Montag, 26. März 2012, 17:00–17:15, BH 334

Hybrid TD-NRG and tDMRG method — •Fabian Güttge and Frithjof B. Anders — Technische Universität Dortmund, Lehrstuhl für Theoretische Physik II, 44221 Dortmund, Germany

We present a non-equilibrium hybrid method which uses the numerical renormalization group (NRG) to generate an effective low energy Hamiltonian. This Hamiltonian is then solved with the density matrix renormalization group (DMRG) thereby reducing the major drawbacks of both methods: (i) discretization errors are minimized by not using a pure Wilson chain and (ii) long time scales can be simulated even for a very large bandwidth. The validity of this method is established by comparing the results to exact results for the resonant level model (RLM). We also apply this new NRG+DMRG hybrid method to the interacting RLM, which is not exactly solvable, and compare with analytic results in the limit U→∞.