A real-time RG analysis for the interacting resonant level model – Niels Bohr Institute - University of Copenhagen

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Niels Bohr Institute > Calendar > 2009 > A real-time RG analysi...

A real-time RG analysis for the interacting resonant level model

The non-equilibrium real-time renormalization group in frequency space is applied to the interaction resonant level model as a minimal model for the description of charge fluctuations. Within a Liouville operator formalism the approach developed for local quantum systems coupled to an environment provides an analytical solution of the flow equations in the weak-coupling regime, both in the stationary limit and for the time evolution.

We present results for the charge susceptibility and the conductance, characterized by a new scaling behavior as function of the bias voltage.
The effects of asymmetric tunneling or Coulomb couplings to the leads are discussed. For the time-evolution into the stationary state, the occupation probabilities and the current exhibit power laws in the long-time limit.

Talk by Sabine Andergassen, RWTH Aachen, Germany