Dresden 2003 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.90: Poster

Donnerstag, 27. März 2003, 15:30–18:00, P1

Quantum pinning depinning transition in one dimensional systems — •Florian Krajewski¹ and Martin Müser² — ¹Institut für Physik, WA 331, Johannes Gutenberg Universität, Mainz, Germany — ²Department of Applied Mathematics, University of Western Ontario, London, Ontario, Canada

We study the quantum pinning depinning transition for a discrete one dimensional Sine-Gordon chain and related models with the sinus shaped potential replaced by different kinds of disordered potentials. We use a path integral molecular dynamics simulation and the centroid molecular dynamics method. This allows us to calculate exactly the dispersion relation and a driving force velocity relation for the systems. For the Sine-Gordon model and disordered potentials with roughness exponent 0 we find a quantum pinning depinning phase transition while systems with roughness exponent 1 are always pinned and always show a gap in the dispersion relation.