CLUSTER MECHANISMS IN THE FULLY FRUSTRATED ISING-MODEL

The cluster algorithm in the fully frustrated Ising model on the squar e lattice is essentially different from the ones used in other systems . Thus its better understanding is particularly important for finding new lines of development. Therefore we investigate it in detail. In ou r simulations of high statistics more appropriate choices of the proba bility for freezing bonds and of that for flipping spins are seen to l ead to better results. In an analysis of the topological properties we derive a set of rules for possible cluster configurations and give a classification by pairs of winding numbers.