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 approximate to 0 and nu approximate to 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.
Strong universality and algebraic scaling in two-dimensional Ising spin glasses / T., Joerg; Lukic, Jovanka; Marinari, Vincenzo; O. C., Martin. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 96:23(2006), pp. 237205-237208. [10.1103/physrevlett.96.237205]
Strong universality and algebraic scaling in two-dimensional Ising spin glasses
LUKIC, JOVANKA;MARINARI, Vincenzo;
2006
Abstract
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 approximate to 0 and nu approximate to 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.