Friday, July 19, 2013

1307.4998 (Janus Collaboration et al.)

Dynamical Transition in the D =3 Edwards-Anderson spin glass in an
external magnetic field

Janus Collaboration, M. Baity-Jesi, R. Alvarez Baños, A. Cruz, L. A. Fernandez, J. M. Gil-Narvion, Gordillo-Guerrero, D. Iñiguez, A. Maiorano, F. Mantovani, E. Marinari, V. Martin-Mayor, J. Monforte-Garcia, A. Muñoz Sudupe, D. Navarro, G. Parisi, S. Perez-Gaviro, M. Pivanti, J. J. Ruiz-Lorenzo, S. F. Schifano, B. Seoane, A. Tarancon, F. Ricci-Tersenghi, R. Tripiccione, D. Yllanes
We study the off-equilibrium dynamics of the three-dimensional Ising spin glass in the presence of an external magnetic field. We have performed simulations both with fixed temperature and with an annealing algorithm. Thanks to the Janus special-purpose computer, based on FPGAs, we have been able to reach times up to 0.01 s. We have studied the relaxation both for high and for low temperature, clearly identifying a dynamical transition point. This dynamical temperature is non-vanishing and depends on the external applied magnetic field. We discuss different possibilities for the underlying physics, which include a thermodynamical spin-glass transition or a mode-coupling crossover
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