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TT: Tiefe Temperaturen

TT 17: Postersitzung II: Transport, Quantenkoh
ärenz, Quantenflüssigkeiten

TT 17.28: Poster

Dienstag, 9. März 2004, 14:30–19:00, Poster A

Schrödinger-dynamics of a spin-chain in contact with a quantum environment — •Markus Henrich, Michael Hartmann, Mathias Michel, and Günter Mahler — Institut für Theoretische Physik 1, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart

We study the exact Schrödinger-dynamics of a spin-chain with nearest-neighbour interaction coupled to a finite quantum environment. The relaxation behavior of the spin-chain is analyzed for two coupling topologies; 1. all spins are directly coupled to the environment, 2. only one edge of the spin-chain is coupled to the environment. Various coupling strengths between the spins as well as various initial states are considered. We then analyze the conditions under which a thermodynamical description should become appropriate for the entire spin-system or even for the induvidual spins.