Nature of the spin glass state

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...

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Veröffentlicht in:Physical review letters 2000-10, Vol.85 (14), p.3017-3020
Hauptverfasser: Palassini, M, Young, A P
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.85.3017