Berlin 2005 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 34: Poster

DY 34.113: Poster

Montag, 7. März 2005, 15:30–18:00, Poster TU D

Lattice solitons under dissipative and stochastic forces — •Christian Brunhuber and Franz Georg Mertens — Universitaet Bayreuth, TP 1 , Universitaetsstr. , 95440 Bayreuth

Anharmonic atomic chains can posses soliton solutions which were used in the past to model different physical phenomena. The shape of the lattice solitons depends strongly on the interaction potential of the particles (e.g. non-local forces). We study the motion of such excitations in the presence of thermal fluctuations and/or dissipation. We apply both analytical calculations in the continuum limit and simulations of the discrete chain. We observe that the perturbed solitons show surprising phenomena concerning their stability and diffusive behaviour.