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DY: Fachverband Dynamik und Statistische Physik

DY 40: Poster - Quantum Systems/ Stat. Phys./ Diffusive Process

DY 40.10: Poster

Thursday, April 3, 2014, 17:00–19:00, P3

Coherent dynamics of a quantum spin coupled to a fermionic bath — •Lars-Hendrik Frahm, Benjamin Baxevanis, and Daniela Pfannkuche — I. Institut für Theoretische Physik, Universität Hamburg, Germany

We investigate the dynamics of a quantum spin system weakly coupled to its environment. The environment is modeled by a bath of fermions coupled by exchange interaction to the spin system. Partial polarization of the fermionic bath affects the spin dynamics and we investigate its impact on the precession and coherence of the spin system. In order to determine the coherent dynamics of the spin system coupled to the bath, we calculate the time evolution of coherent states, i.e. off-diagonal density matrix elements. This is achieved by employing the time-convolutionless projection operator technique which allows for the computation of the coherent, non-Markovian spin dynamics.