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 at fixed temperature and with an annealing protocol. Thanks to the Janus special-purpose computer, based on field-programmable gate array (FPGAs), we have been able to reach times equivalent to 0.01 s in experiments. We have studied the system relaxation both for high and for low temperatures, clearly identifying a dynamical transition point. This dynamical temperature is strictly positive and depends on the external applied magnetic field. We discuss different possibilities for the underlying physics, which include a thermodynamical spin-glass transition, a mode-coupling crossover, or an interpretation reminiscent of the random first-order picture of structural glasses.
Dynamical transition in the D=3 Edwards-Anderson spin glass in an external magnetic field / M., B.J., R. A., B., A., C., L. A., F., J. M., G.N., A., G.G., D., I., Maiorano, A., F., M., Marinari, V., V., M.M., J., M.G., A., M.S., D., N., Parisi, G., S., P.G., M., P., RICCI TERSENGHI, F., J. J., R.L., S. F., S., et al.. - In: PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS. - ISSN 1539-3755. - 89:3(2014), p. 032140. [10.1103/physreve.89.032140]
Dynamical transition in the D=3 Edwards-Anderson spin glass in an external magnetic field
MAIORANO, Andrea;MARINARI, Vincenzo;PARISI, Giorgio;RICCI TERSENGHI, Federico;SEOANE BARTOLOME, BEATRIZ;YLLANES MOSQUERA, DAVID
2014
Abstract
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 at fixed temperature and with an annealing protocol. Thanks to the Janus special-purpose computer, based on field-programmable gate array (FPGAs), we have been able to reach times equivalent to 0.01 s in experiments. We have studied the system relaxation both for high and for low temperatures, clearly identifying a dynamical transition point. This dynamical temperature is strictly positive and depends on the external applied magnetic field. We discuss different possibilities for the underlying physics, which include a thermodynamical spin-glass transition, a mode-coupling crossover, or an interpretation reminiscent of the random first-order picture of structural glasses.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
