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Hybrid NRG-DMRG approach to real-time dynamics of quantum impurity systems

Frithjof Anders, TU Dortmund

29.11.2013 at 10:15 


A hybrid approach to nonequilibrium dynamics of quantum impurity systemsis presented. The numerical renormalization group serves as a means to generate a suitable low-energy Hamiltonian, allowing for an accurate evaluation of the real-time dynamics of the problem up to exponentially long times using primarily the time-adaptive density-matrix renormalization group. In particular, by constructing a suitable hybrid chain, discretization errors are essentially eliminated on all time scales of interest. We extract the decay time of the interaction-enhanced oscillations in the interacting resonant-level model and show their quadratic divergence with the interaction strength U. Our numerical analysis is in excellent agreement with analytic predictions based on an expansion in 1/U.

A348 - Theresienstr. 37