| speaker: | Frithjof Anders Bremen, Germany |
| time: | Tu., 21.08, 11:20-12:10 |
In contrast to equilibrium conditions, the understanding of real-time evolution of many-particle quantum systems is still at its infancy. A novel approach to time dependent non-equilibrium quantum impurity systems based on the identification of a complete basis set of NRG chain is presented. We will show spin and charge dynamics of simple quantum-impurities in interaction with fermionic or bosonic baths. The spin-boson model is often used in context of decoherence of qubits as well as for charge transfer reactions in chemistry. Real-time dynamics for the spin-boson model close to the quantum-phase transition are present for the sub-ohmic regime which is inaccessible to perturbative approaches. An interacting spin-degenerate level is used to describes spin- and charge-relaxation processes in ultra-small quantum dots. I will discuss recent extension of this method to charge transport through quantum dots and new concepts for a scattering state numerical renormalization group approach.