Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
DY: Dynamik und Statistische Physik
DY 34: Poster
DY 34.117: Poster
Montag, 7. März 2005, 15:30–18:00, Poster TU D
Critical dynamics of disordered model C — •Reinhard Folk1, Maxym Dudka1,2, Yurij Holovatch1,2,3, and Günter Moser4 — 1Institute für Theoretische Physik, Johannes Kepler Universität Linz, A-4040 Linz, Austria — 2Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine, UA-79011 Lviv, Ukraine — 3Ivan Franko National University of Lviv, UA-79005 Lviv, Ukraine — 4Abteilung für Physik und Biophysik, Univerität Salzburg, A-5020 Salzburg, Austria
We study the relaxational critical dynamics of the ϕ4-model with an additional coupling between the order parameter ϕ and a conserved density - model C [1,2] - in presence of disorder. The asymptotic critical behavior of this model reduces to that of model A. However, the disorder affects considerably the non-asymptotic dynamical behavior. A field-theoretical renormalization group analysis of disordered model C is possible observing the same structure for dynamical vertex functions as for pure model. The investigations of asymptotic and effective critical behavior are performed mostly for region n<nc, where disorder is relevant in statics. The non-monotonic character of the temperature dependence of the dynamical effective critical exponent zeff at approach to the asymptotic regime is demonstrated.
[1] B. I. Halperin, P. C. Hohenberg, S.-k. Ma, Phys. Rev. B 10, 139 (1974).
[2] R. Folk, G. Moser, Phys. Rev. Lett. 91, 030601 (2003); R. Folk, G. Moser, Phys. Rev. E 69, 036101 (2004).