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On the true low-energy excitations of the three-dimensional spin glass
Claudio Chilin, Enzo Marinari, Víctor Martín-Mayor +3
We study the low-energy excitations of the three dimensional spin glass through a large-scale Monte Carlo simulation on lattices up to . We find smooth extrapolations down to…
Quantifying memory in spin glasses
Janus Collaboration, I. Paga, J. He +24
Rejuvenation and memory, long considered the distinguishing features of spin glasses, have recently been proven to result from the growth of multiple length scales. This insight, e…
Memory and rejuvenation in spin glasses: aging systems are ruled by more than one length scale
Janus Collaboration, M. Baity-Jesi, E. Calore +22
Memory and rejuvenation effects in the magnetic response of off-equilibrium spin glasses have been widely regarded as the doorway into the experimental exploration of ultrametricit…
On the superposition principle and non-linear response in spin glasses
I. Paga, Q. Zhai, M. Baity-Jesi +25
The extended principle of superposition has been a touchstone of spin glass dynamics for almost thirty years. The Uppsala group has demonstrated its validity for the metallic spin…
Supervised perceptron learning vs unsupervised Hebbian unlearning: Approaching optimal memory retrieval in Hopfield-like networks
Marco Benedetti, Enrico Ventura, Enzo Marinari +2
The Hebbian unlearning algorithm, i.e. an unsupervised local procedure used to improve the retrieval properties in Hopfield-like neural networks, is numerically compared to a super…
Recognition Capabilities of a Hopfield Model with Auxiliary Hidden Neurons
Marco Benedetti, Victor Dotsenko, Giulia Fischetti +2
We study the recognition capabilities of the Hopfield model with auxiliary hidden layers, which emerge naturally upon a Hubbard-Stratonovich transformation. We show that the recogn…
Temperature chaos is present in off-equilibrium spin-glass dynamics
Janus Collaboration, M. Baity-Jesi, E. Calore +22
We find a dynamic effect in the non-equilibrium dynamics of a spin glass that closely parallels equilibrium temperature chaos. This effect, that we name dynamic temperature chaos,…
Dimensional crossover in the aging dynamics of spin glasses in a film geometry
L. A. Fernandez, E. Marinari, V. Martin-Mayor +2
Motivated by recent experiments of exceptional accuracy, we study numerically the spin-glass dynamics in a film geometry. We cover all the relevant time regimes, from picoseconds t…
Forgetting Memories and their Attractiveness
Enzo Marinari
We study numerically the memory which forgets, introduced in 1986 by Parisi by bounding the synaptic strength, with a mechanism which avoid confusion, allows to remember the patter…
The out-equilibrium 2D Ising spin glass: almost, but not quite, a free-field theory
L. A. Fernandez, E. Marinari, V. Martin-Mayor +2
We consider the spatial correlation function of the two-dimensional Ising spin glass under out-equilibrium conditions. We pay special attention to the scaling limit reached upon ap…
An experiment-oriented analysis of 2D spin-glass dynamics: a twelve time-decades scaling study
L. A. Fernandez, E. Marinari, V. Martin-Mayor +2
Recent high precision experimental results on spin-glass films ask for a detailed understanding of the domain-growth dynamics of two-dimensional spin glasses. To achieve this goal,…
The Mpemba effect in spin glasses is a persistent memory effect
Janus collaboration, M. Baity-Jesi, E. Calore +21
The Mpemba effect occurs when a hot system cools faster than an initially colder one, when both are refrigerated in the same thermal reservoir. Using the custom built supercomputer…
Aging rate of spin glasses from simulations matches experiments
Janus Collaboration, M. Baity-Jesi, E. Calore +20
Experiments on spin glasses can now make precise measurements of the exponent governing the growth of glassy domains, while our computational capabilities allow us to make q…
Numerical evidences of universal trap-like aging dynamics
Chiara Cammarota, Enzo Marinari
Trap models have been initially proposed as toy models for dynamical relaxation in extremely simplified rough potential energy landscapes. Their importance has considerably grown r…
Matching microscopic and macroscopic responses in glasses
Janus Collaboration, M. Baity-Jesi, E. Calore +20
We first reproduce on the Janus and Janus II computers a milestone experiment that measures the spin-glass coherence length through the lowering of free-energy barriers induced by…
Numerical construction of the Aizenman-Wehr metastate
A. Billoire, L. A. Fernandez, A. Maiorano +6
Chaotic size dependence makes it extremely difficult to take the thermodynamic limit in disordered systems. Instead, the metastate, which is a distribution over thermodynamic state…
A statics-dynamics equivalence through the fluctuation-dissipation ratio provides a window into the spin-glass phase from nonequilibrium measurements
Janus Collaboration, M. Baity-Jesi, E. Calore +20
The unifying feature of glass formers (such as polymers, supercooled liquids, colloids, granulars, spin glasses, superconductors, ...) is a sluggish dynamics at low temperatures. I…
Temperature chaos is a non-local effect
L. A. Fernandez, E. Marinari, V. Martin-Mayor +2
Temperature chaos plays a role in important effects, like for example memory and rejuvenation, in spin glasses, colloids, polymers. We numerically investigate temperature chaos in…
Universal critical behavior of the 2d Ising spin glass
L. A. Fernandez, E. Marinari, V. Martin-Mayor +2
We use finite size scaling to study Ising spin glasses in two spatial dimensions. The issue of universality is addressed by comparing discrete and continuous probability distributi…
Spontaneous energy-barrier formation in an entropy-driven glassy dynamics
Chiara Cammarota, Enzo Marinari
The description of activated relaxation of glassy systems in the multidimensional configurational space is a long-standing open problem. We develop a phenomenological description o…
Comment on "Evidence of Non-Mean-Field-Like Low-Temperature Behavior in the Edwards-Anderson Spin-Glass Model"
A. Billoire, L. A. Fernandez, A. Maiorano +6
A recent interesting paper [Yucesoy et al. Phys. Rev. Lett. 109, 177204 (2012), arXiv:1206:0783] compares the low-temperature phase of the 3D Edwards-Anderson (EA) model to its mea…
Von Neumann's growth model: statistical mechanics and biological applications
Andrea De Martino, Enzo Marinari, Andrea Romualdi
We review recent work on the statistical mechanics of Von Neumann's growth model and discuss its application to cellular metabolic networks. In this context, we present a detailed…
Thermodynamic glass transition in a spin glass without time-reversal symmetry
Janus Collaboration, R. A. Baños, A. Cruz +20
Spin glasses are a longstanding model for the sluggish dynamics that appears at the glass transition. However, spin glasses differ from structural glasses for a crucial feature: th…
Critical Behavior of Three-Dimensional Disordered Potts Models with Many States
R. Alvarez Banos, A. Cruz, L. A. Fernandez +18
We study the 3D Disordered Potts Model with p=5 and p=6. Our numerical simulations (that severely slow down for increasing p) detect a very clear spin glass phase transition. We ev…