Physics – Condensed Matter – Statistical Mechanics
Scientific paper
1998-08-17
Int. J. of Mod. Phys. B 12 (1998) 2385
Physics
Condensed Matter
Statistical Mechanics
9 pages, Revtex
Scientific paper
10.1142/S0217979298001393
Using a quantum formulation of the master equation we study a kinetic Ising model with competing stochastic processes: the Glauber dynamics with probability $p$ and the Kawasaki dynamics with probability $1 - p$. Introducing explicitely the coupling to a heat bath and the mutual static interaction of the spins the model can be traced back exactly to a Ginzburg Landau functional when the interaction is of long range order. The dependence of the correlation length on the temperature and on the probability $p$ is calculated. In case that the spins are subject to flip processes the correlation length disappears for each finite temperature. In the exchange dominated case the system is strongly correlated for each temperature.
Artz Simone
Trimper Steffen
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