Antiferromagnetic Ising model applet: Metropolis algorithm
As opposed to the ferromagnetic Ising/Potts models, the coupling constant J for the AF model is negative, thus favoring spin anti-alignement at low temperature (press the "Groundstate" button and look at the lattice: the ground-state is indeed a checkerboard). Applet help: The "temperature" button let you configure many things regarding the simulation, e.g. temperature sweep, number of thermalization steps, number of measurements, autocorrelation times, ... if the applet runs too slowly, reduce the "Latency". If still slow, deselect the "Animate" checkbox. The south-panel displays charts of thermodymical averages as a funtion of temperature. You can add a new point at any time during a simulation by clicking on the "Add point" button. If a temperature sweep is carried out, charts are filled automatically. Download source code : montecarlo.zip

S. Reynal (ENSEA/UCP)