Published on Nov 18, 2012
The Ising model is a simplified mathematical description of phase transitions. The model consists of a lattice of spins, each of which interacts with its nearest neighbors, as well as with an external field. In the absence of an external field, the model undergoes a transition from disorder (where the spins are more or less randomly aligned) to order (where the spins are aligned) at a certain temperature, called the critical temperature.
This Metropolis-Hastings simulation tracks a 512x512 spin lattice, with each spin represented by a square on the grid. Dark sites point down, while light sites point up. The temperature, shown on the right-hand side, slowly drops from 10% above the critical temperature to 10% below the critical temperature. As this happens, phase boundaries develop between regions where the spins point upwards and downwards. Below the spin lattice, the average energy, E/E0, magnetization, m, and nearest-neighbor correlation, G(1), are shown.
This Metropolis-Hastings simulation tracks a 512x512 spin lattice, with each spin represented by a square on the grid. Dark sites point down, while light sites point up. The temperature, shown on the right-hand side, slowly drops from 10% above the critical temperature to 10% below the critical temperature. As this happens, phase boundaries develop between regions where the spins point upwards and downwards. Below the spin lattice, the average energy, E/E0, magnetization, m, and nearest-neighbor correlation, G(1), are shown.
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