Monte Carlo Simulations of Spin-Glases at Low Tempeartures: Effects of Free Boundary Conditions

Helmut G. Katzgraber and A.P. Young

We present results of Monte Carlo simulations, using parallel tempering, on the three- and four-dimensional Edwards-Anderson (EA) Ising spin-glass with Gaussian couplings at low temperatures with free boundary conditions. Our results suggest that large-scale low-energy excitations may be space filling. The data implies that the energy of these excitations increases with increasing system size for small systems, but we see evidence in three dimensions, where we have a greater range of sizes, for a crossover to a regime where the energy is independent of system size, in accordance with replica symmetry breaking.

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