Strong universality and algebraic scaling in two-dimensional Ising spin glasses.
At zero temperature, two-dimensional Ising spin glasses are known to fall into several universality classes. Here we consider the scaling at low but nonzero temperatures and provide numerical evidence that eta approximately equal 0 and nu approximately equal 3.5 in all cases, suggesting a unique universality class. This algebraic (as opposed to exponential) scaling holds, in particular, for the +/- J model, with or without dilutions, and for the plaquette diluted model. Such a picture, associated with an exceptional behavior at T = 0, is consistent with a real space renormalization group approach. We also explain how the scaling of the specific heat is compatible with the hyperscaling prediction.
Jörg
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Dipartimento di Fisica, Università di Roma "La Sapienza," SMC and INFM, Piazzale Aldo Moro 2, 00185 Roma, Italy.
Lukic
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Marinari
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Martin
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