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TT: Fachverband Tiefe Temperaturen

TT 28: Transport - Poster Session

TT 28.19: Poster

Donnerstag, 29. März 2007, 14:00–17:45, Poster A

Dynamics of quantum coherence in a spin-1 Heisenberg chain — •Jakob Meineke and Joachim Ankerhold — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, 79104 Freiburg

We study the non-equilibrium dynamics of a one-dimensional spin-1 chain (XXZ Heisenberg model) of finite length. This model can be used to describe many-body-correlations in ultra-cold Rydberg-gases in optical lattices. Our goal is to understand the dynamics of collective modes of the interacting atoms. Of special interest are Förster-like transfer processes, which involve coherent exchange of energy and ultimately lead to an entanglement state of the entire ensemble. We present results obtained by exact diagonalization and by semiclassical methods related to the non-linear sigma-model.