Open AccessNonequilibrium dynamic phase transition in a kinetic Ising spin system
Author(s) -
Shao Yuan-Zhi,
Zhong Wei-Rong,
Lu Hua-Quan,
Lei Shi-Fu
Publication year - 2006
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.55.2057
Subject(s) - physics , non equilibrium thermodynamics , glauber , phase transition , condensed matter physics , kinetic energy , amplitude , critical point (mathematics) , spin (aerodynamics) , ising model , phase (matter) , statistical physics , quantum mechanics , thermodynamics , scattering , mathematics , mathematical analysis
We studied within the framework of a mean-field approach the nonequilibrium dyn amic phase transition of a kinetic Ising spin system subject to a perturbative f ield and temperature simultaneously by comparison between time-dependent Ginzbur g-Landau and Glauber dynamics models. The dynamic phase transition (DPT) boundar ies, separating a symmetry-breaking dynamic ordered phase from its symmetric dyn amic disordered counterpart, were identified through a systematic simulation of the above two models. The dependence of the dynamic order parameter Q and the fo urth order cumulant ratio U upon the temperature t(r0), the frequency ω and amplitude h0 of driving field were also investigated in detai l. A discussion was presented concerning the current controversies on whether bo th a discontinuous dynamic phase transition occurs possibly below a specific low temperature and a tri-critical point exists on the DPT boundary in a kinetic Is ing spin system.