title: Nature of the spin glass state.
abstract: The nature of the spin glass state is investigated by studying changes to the ground state when a weak perturbation is applied to the bulk of the system. We consider short range models in three and four dimensions and the infinite range Sherrington-Kirkpatrick (SK) and Viana-Bray models. Our results for the SK and Viana-Bray models agree with the replica symmetry breaking picture. The data for the short range models fit naturally a picture in which there are large scale excitations which cost a finite energy but whose surface has a fractal dimension, d(s), less than the space dimension d. We also discuss the possible crossover to other behavior at larger length scales than the sizes studied.
authors.affiliation: Department of Physics, University of California, Santa Cruz, California 95064, USA.
authors.forename: M
authors.initials: M
authors.lastname: Palassini
authors.forename: A P
authors.initials: AP
authors.lastname: Young