Scaling approach for the time-dependent Kondo model
Strongly Correlated Electrons
2011-03-07 v1 Quantum Physics
Abstract
We present a new nonperturbative method to deal with the time-dependent quantum many-body problem, which is an extension of Wegner's flow equations to time-dependent Hamiltonians. The formalism provides a scaling procedure for the set of time-dependent interaction constants. We apply these ideas to a Kondo model with a ferromagnetic exchange coupling switched on over a time scale . We show that the asymptotic expectation value of the impurity spin interpolates continuously between its quenched and adiabatic value.
Cite
@article{arxiv.1011.1281,
title = {Scaling approach for the time-dependent Kondo model},
author = {C. Tomaras and S. Kehrein},
journal= {arXiv preprint arXiv:1011.1281},
year = {2011}
}