title: Thermodynamic glass transition in a spin glass without time-reversal symmetry.
abstract: Spin glasses are a longstanding model for the sluggish dynamics that appear at the glass transition. However, spin glasses differ from structural glasses in a crucial feature: they enjoy a time reversal symmetry. This symmetry can be broken by applying an external magnetic field, but embarrassingly little is known about the critical behavior of a spin glass in a field. In this context, the space dimension is crucial. Simulations are easier to interpret in a large number of dimensions, but one must work below the upper critical dimension (i.e., in d < 6) in order for results to have relevance for experiments. Here we show conclusive evidence for the presence of a phase transition in a four-dimensional spin glass in a field. Two ingredients were crucial for this achievement: massive numerical simulations were carried out on the Janus special-purpose computer, and a new and powerful finite-size scaling method.
authors.affiliation: Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50009 Zaragoza, Spain.
authors.forename: Raquel Alvarez
authors.initials: RA
authors.lastname: Baños
authors.forename: Andres
authors.initials: A
authors.lastname: Cruz
authors.forename: Luis Antonio
authors.initials: LA
authors.lastname: Fernandez
authors.forename: Jose Miguel
authors.initials: JM
authors.lastname: Gil-Narvion
authors.forename: Antonio
authors.initials: A
authors.lastname: Gordillo-Guerrero
authors.forename: Marco
authors.initials: M
authors.lastname: Guidetti
authors.forename: David
authors.initials: D
authors.lastname: Iñiguez
authors.forename: Andrea
authors.initials: A
authors.lastname: Maiorano
authors.forename: Enzo
authors.initials: E
authors.lastname: Marinari
authors.forename: Victor
authors.initials: V
authors.lastname: Martin-Mayor
authors.forename: Jorge
authors.initials: J
authors.lastname: Monforte-Garcia
authors.forename: Antonio
authors.initials: A
authors.lastname: Muñoz Sudupe
authors.forename: Denis
authors.initials: D
authors.lastname: Navarro
authors.forename: Giorgio
authors.initials: G
authors.lastname: Parisi
authors.forename: Sergio
authors.initials: S
authors.lastname: Perez-Gaviro
authors.forename: Juan Jesus
authors.initials: JJ
authors.lastname: Ruiz-Lorenzo
authors.forename: Sebastiano Fabio
authors.initials: SF
authors.lastname: Schifano
authors.forename: Beatriz
authors.initials: B
authors.lastname: Seoane
authors.forename: Alfonso
authors.initials: A
authors.lastname: Tarancon
authors.forename: Pedro
authors.initials: P
authors.lastname: Tellez
authors.forename: Raffaele
authors.initials: R
authors.lastname: Tripiccione
authors.forename: David
authors.initials: D
authors.lastname: Yllanes