Opened Access Overdamped sine-Gordon kink in a thermal bath

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Autor: Quintero, Niurka R.
Sánchez Sánchez, Ángel
Mertens, Franz G.
Departamento: Universidad de Sevilla. Departamento de Física Aplicada I
Fecha: 1999
Publicado en: Physical Review E, 60 (1), 220-230
Tipo de documento: Artículo
Resumen: We study sine-Gordon kink diffusion at finite temperature in the overdamped limit. By means of a general perturbative approach, we calculate the first- and second-order ~ in temperature ! contributions to the diffusion coefficient. We compare our analytical predictions with numerical simulations. The good agreement allows us to conclude that, up to temperatures where kink-antikink nucleation processes cannot be neglected, a diffusion constant linear and quadratic in temperature gives a very accurate description of the diffusive motion of the kink. The quadratic temperature dependence is shown to stem from the interaction with the phonons. In addition, we calculate and compute the average value ^ f ( x , t ) & of the wave function as a function of time, and show that its width grows with A t . We discuss the interpretation of this finding and show that it arises from the dispersion of the kink center positions of individual realizations which al...
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Tamaño: 186.6Kb
Formato: PDF

URI: http://hdl.handle.net/11441/23754

DOI: 10.1103/PhysRevE.60.222

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