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DY: Fachverband Dynamik und Statistische Physik
DY 23: Statistical physics far from thermal equilibrium
DY 23.4: Talk
Thursday, March 26, 2009, 15:00–15:15, HÜL 386
Lateral transport of interfacial fluctuations in driven lattice models — Thomas H. R. Smith1, Oleg Vasilyev2, •Anna Maciolek2,3, and Matthias Schmidt1,4 — 1H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom — 2Max-Planck-Institut für Metallforschung, Heisenbergstraße 3, D-70569 Stuttgart, Germany — 3Institute of Physical Chemistry, Polish Academy of Sciences, Department III, Kasprzaka 44/52, PL-01-224 Warsaw, Poland — 4Theoretische Physik II, Universität Bayreuth, Universitätsstraße 30, D-95440 Bayreuth, Germany
We investigate whether thermal fluctuations of the interface between coexisting phases can be coherently transported along the interface by the action of a suitably chosen external driving field. The Ising lattice gas is studied with kinetic Monte Carlo (MC) simulations using Kawasaki exchange dynamics. We apply a variety of different external fields, which may vary in space, in order to create a particle current in the direction parallel to the interface. Lateral motion of thermal capillary waves occurs only if the driving field is an odd function of the coordinate perpendicular to the averge interface plane. We argue that this interfacial transport is intimately related to a broken symmetry under space reflection and particle-hole inversion. The behaviour of the interfacial current in the Ising model, as well as results from MC simulations of a corresponding solid-on-solid model indicate that the effect is not advective but that it is induced by the motion solely of particles at the interface.