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- Centro Brasileiro de Pesquisas FísicasBR50 papers
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6 papers · 2 filters
Comparing Monte Carlo methods for finding ground states of Ising spin glasses: population annealing, simulated annealing and parallel tempering
Wenlong Wang, Jonathan Machta, Helmut G. Katzgraber
Population annealing is a Monte Carlo algorithm that marries features from simulated annealing and parallel tempering Monte Carlo. As such, it is ideal to overcome large energy bar…
Low-temperature behavior of the statistics of the overlap distribution in Ising spin-glass models
Matthew Wittmann, B. Yucesoy, Helmut G. Katzgraber +2
Using Monte Carlo simulations, we study in detail the overlap distribution for individual samples for several spin-glass models including the infinite-range Sherrington-Kirkpatrick…
Evidence against a mean field description of short-range spin glasses revealed through thermal boundary conditions
Wenlong Wang, Jonathan Machta, Helmut G. Katzgraber
A theoretical description of the low-temperature phase of short-range spin glasses has remained elusive for decades. In particular, it is unclear if theories that assert a single p…
Existence of a Thermodynamic Spin-Glass Phase in the Zero-Concentration Limit of Anisotropic Dipolar Systems
Juan Carlos Andresen, Helmut G. Katzgraber, Vadim Oganesyan +1
The nature of ordering in dilute dipolar interacting systems dates back to the work of Debye and is one of the most basic, oldest and as-of-yet unsettled problems in magnetism. Whi…
The effect of quenched bond disorder on first-order phase transitions
Arash Bellafard, Sudip Chakravarty, Matthias Troyer +1
We investigate the effect of quenched bond disorder on the two-dimensional three-color Ashkin-Teller model, which undergoes a first-order phase transition in the absence of impurit…
Micro-transition cascades to percolation
Wei Chen, Malte Schröder, Raissa M. D'Souza +2
We report the discovery of a discrete hierarchy of micro-transitions occurring in models of continuous and discontinuous percolation. The precursory micro-transitions allow us to t…