Calculation of ground states of four-dimensional +or- J Ising spin glasses
Alexander K. Hartmann
Abstract
Ground states of four-dimensional (d=4) EA Ising spin glasses are calculated for sizes up to 7x7x7x7 using a combination of a genetic algorithm and cluster-exact approximation. The ground-state energy of the infinite system is extrapolated as e0=-2.095(1). The ground-state stiffness (or domain wall) energy D is calculated. A D~LΘ behavior with Θ=0.65(4) is found which confirms that the d=4 model has an equilibrium spin-glass-paramagnet transition for non-zero Tc.
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