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DY: Fachverband Dynamik und Statistische Physik

DY 27: Statistical Physics II

DY 27.3: Vortrag

Dienstag, 17. März 2020, 10:30–10:45, ZEU 118

Interfaces: A step beyond the elastic approximation — •Nirvana Caballero and Thierry Giamarchi — University of Geneva

Diverse systems including ferroic domain walls, cell fronts, or contact lines have been usually described as disordered elastic systems, even when critical hypotheses of the theory are not satisfied. Solving domain walls dynamics and statics beyond the elastic approximation is still a largely open theoretical/analytical problem. In this work, we propose to address it by analyzing a Ginzburg-Landau model, which describes the main dynamics of driven systems and where interfaces with bubbles and overhangs can be studied. We show the connection between the two-dimensional Ginzburg-Landau model and the one-dimensional elastic description for disordered systems and probe the validity of the elastic theory as a function of "defects''. We examine observables such as the interface roughness and the structure factor, both numerically and analytically. Our simulations and calculations, in addition to making contact with experiments, allow to test and provide insight to develop new analytical approaches to this problem.