Ground-state energy and entropy of the two-dimensional Edwards-Anderson spin-glass model with different bond distributions

Abstract

We study the two-dimensional Edwards–Anderson spin-glass model using a parallel tempering Monte Carlo algorithm. The ground-state energy and entropy are calculated for different bond distributions. In particular, the entropy is obtained by using a thermodynamic integration technique and an appropriate reference state, which is determined with the method of high-temperature expansion. This strategy provides accurate values of this quantity for finite-size lattices. By extrapolating to the thermodynamic limit, the groundstate energy and entropy of the different versions of the spin-glass model are determined.