Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
1998-10-05
Eur. Phys. J. B 8 , 619 (1999)
Physics
Condensed Matter
Disordered Systems and Neural Networks
9 pages, revtex, 11 figures, 51 references
Scientific paper
10.1007/s100510050729
Large numbers of ground states of two-dimensional Ising spin glasses with periodic boundary conditions in both directions are calculated for sizes up to 40^2. A combination of a genetic algorithm and Cluster-Exact Approximation is used. For each quenched realization of the bonds up to 40 independent ground states are obtained. For the infinite system a ground-state energy of e=-1.4015(3) is extrapolated. The ground-state landscape is investigated using a finite-size scaling analysis of the distribution of overlaps. The mean-field picture assuming a complex landscape describes the situation better than the droplet-scaling model, where for the infinite system mainly two ground states exist. Strong evidence is found that the ground states are not organized in an ultrametric fashion in contrast to previous results for three-dimensional spin glasses.
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