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TT: Tiefe Temperaturen

TT 30: Postersitzung IV: Kritische Ph
änomene, Quantenstörstellen, niederdimensionale Systeme

TT 30.35: Poster

Thursday, March 11, 2004, 14:30–19:00, Poster A

Domain Walls in 1D Systems - QM and Finite Size Corrections — •Markus Lippert, Hans-Joachim Elmers, and Peter G. J. van Dongen — Institut für Physik, Johannes Gutenberg-Universität, Staudinger Weg 7, D-55099 Mainz, Germany

We consider 1D domain walls in order to describe 1D nanoscale magnetic systems, in which such walls can be realized experimentally. Due to the discrete structure of these walls, a phase transition between an Ising-type and an extended wall is found. In order to evaluate quantum corrections, we use a systematic 1/S expansion in combination with a new numerical method to evaluate these corrections. We compare to results already known in literature and extend our theory to the calculation of shape corrections and quantum critical behaviour.