IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Metastable and scaling regimes of a one dimensional Kawasaki dynamics
Autor/es:
F. A. GÓMEZ ALBARRACÍN; H. D. ROSALES; M. D. GRYNBERG
Lugar:
Trieste
Reunión:
Conferencia; Conference on Frustration, Disorder and Localization: Statics and Dynamics; 2015
Institución organizadora:
The Abdus Salam International Centre of Theoretical Physics
Resumen:
Conservative dynamics have been extensively studied in the context of phase separation near critical points. In particular, in 1D the low but nonzero temperature Kawasaki dynamics of ferromagnetic Ising chains is known to be dominated by metastable states. These are ultimately responsible for typical domain sizes growing in time as t^{1/3} (z = 3). In this work we consider the asymptotic effects brought about by different metastable structures arising from the inclusion of second neighbor couplings in this 1D model. Several situations with a variety of activation barriers and metastable proliferations are identified, eventually in some cases leading to different scaling asymptotic regimes depending on the coupling ratios. Dynamic exponents (z) are obtained by finite-size scaling analyses of relaxation times, in turn calculated via exact diagonalizations of the evolution operator in finite chains. We present results both for ferromagnetic and antiferromagnetic couplings, and discuss whether frustration plays a significant role. Comparisons with the Glauber dynamics under weak competing interactions are also presented.
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