Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2008-04-17
Phys. Rev. E 78 (2008) 011110
Physics
Condensed Matter
Disordered Systems and Neural Networks
30 pages
Scientific paper
10.1103/PhysRevE.78.011110
We consider the two-dimensional randomly site diluted Ising model and the random-bond +-J Ising model (also called Edwards-Anderson model), and study their critical behavior at the paramagnetic-ferromagnetic transition. The critical behavior of thermodynamic quantities can be derived from a set of renormalization-group equations, in which disorder is a marginally irrelevant perturbation at the two-dimensional Ising fixed point. We discuss their solutions, focusing in particular on the universality of the logarithmic corrections arising from the presence of disorder. Then, we present a finite-size scaling analysis of high-statistics Monte Carlo simulations. The numerical results confirm the renormalization-group predictions, and in particular the universality of the logarithmic corrections to the Ising behavior due to quenched dilution.
Hasenbusch Martin
Pelissetto Andrea
Toldin Francesco Parisen
Vicari Ettore
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