Antiferromagnetic Ising model applet: simulation in the multicanonical ensemble with the Wang-Landau algorithm

Applet help:

  • The S(E) chart on the right side displays the estimate of the microcanonical entropy S(E) in real time.
  • The south-panel displays charts of reweighted thermodymical averages as a funtion of temperature. The "F(kT,E)" button let you visualize the variational free energy. For second-order transitions (as is the case for the AF Ising model), and near the transition temperature, you should witness a single clear minimum.
  • The "temperature" button let you configure many things regarding the simulation, e.g. temperature range for the reweighting procedure, number of measurements between checks histogram roughness, ...
  • if the applet runs too slowly, reduce the "Latency". If still slow, deselect the "Animate" checkbox.

Download source code : montecarlo.zip

S. Reynal (ENSEA/UCP)