Browsing Exact and Earth Sciences by Subject "Modelo de ising"
Now showing items 1-20 of 31
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Domain-size heterogeneity in the Ising model : geometrical and thermal transition
(2015) [Journal article]A measure of cluster size heterogeneity (H), introduced by Lee et al. [Phys. Rev. E 84, 020101 (2011)] in the context of explosive percolation, was recently applied to random percolation and to domains of parallel spins ... -
Dynamical cluster size heterogeneity
(2020) [Journal article]Only recently has the essential role of the percolation critical point been considered on the dynamical properties of connected regions of aligned spins (domains) after a sudden temperature quench. In equilibrium, it is ... -
Dynamics of the frustrated ising lattice gas
(2000) [Journal article]The dynamical properties of a three-dimensional model glass, the frustrated Ising lattice gas (FILG), are studied by Monte Carlo simulations. We present results of compression experiments, where the chemical potential is ... -
Event-driven Monte Carlo : exact dynamics at all time scales for discrete-variable models
(2016) [Journal article]We present an algorithm for the simulation of the exact real-time dynamics of classical many-body systems with discrete energy levels. In the same spirit of kinetic Monte Carlo methods, a stochastic solution of the master ... -
Geometry of phase separation
(2009) [Journal article]We study the domain geometry during spinodal decomposition of a 50:50 binary mixture in two dimensions. Extending arguments developed to treat nonconserved coarsening, we obtain approximate analytic results for the ... -
Interplay between coarsening and nucleation in an Ising model with dipolar interactions
(2008) [Journal article]We study the dynamical behavior of a square lattice Ising model with exchange and dipolar interactions by means of Monte Carlo simulations. After a sudden quench to low temperatures, we find that the system may undergo a ... -
Inverse transition in the dipolar frustrated Ising ferromagnet : the role of domain walls
(2014) [Journal article]We present a theoretical study aimed at elucidating the origin of the inverse symmetry-breaking transition observed in ultrathinmagnetic films with perpendicular anisotropy.We study the behavior of the dipolar frustrated ... -
Ising nematic phase in ultrathin magnetic films : a Monte Carlo study
(2006) [Journal article]We study the critical properties of a two-dimensional Ising model with competing ferromagnetic exchange and dipolar interactions, which models an ultrathin magnetic film with high out-of-plane anisotropy in the monolayer ... -
Kinetic model for a polmer in one dimension
(1995) [Journal article]We consider a model for a directed polymer on a one-dimensional lattice of width 2, with attractive interactions between monomers that occupy first-neighbor sites on the lattice and are not consecutive along the chain. We ... -
Langevin dynamics of fluctuation-induced first-order phase transitions : self-consistent Hartree approximation
(2007) [Journal article]The Langevin dynamics of a system with a scalar-order parameter exhibiting a fluctuation-induced firstorder phase transition is solved within the self-consistent Hartree approximation. Competition between interactions on ... -
Liquid polymorphism, order-disorder transitions and anomalous behavior : a Monte Carlo study of the Bell-Lavis model for water
(2009) [Journal article]The Bell–Lavis model for liquid water is investigated through numerical simulations. The lattice-gas model on a triangular lattice presents orientational states and is known to present a highly bonded low density phase and ... -
Local persistence and blocking in the two-dimensional Blume-Capel model
(2004) [Journal article] -
Mean field theory of the ising random-amisotropy-axis model in the large-component limit
(1993) [Journal article]The lsing random-anisotropy-axis model with additional noncubic anisotropy is investigated in mean-field theory in the limit p → ∞ for p-component random vectors on a lattice of N sites. The effects of anisotropy for ... -
Microscopic approach to orientational order of domain walls
(2011) [Journal article]We develop a fully microscopic, statistical mechanics approach to study phase transitions in Ising systems with competing interactions at different scales. Our aim is to consider orientational and positional order parameters ... -
Nematic phase in the J1-J2 square-lattice Ising model in an external field
(2015) [Journal article]The J1-J2 Ising model in the square lattice in the presence of an external field is studied by two approaches: the cluster variation method (CVM) and Monte Carlo simulations. The use of the CVM in the square approximation ... -
Nematic phase in two-dimensional frustrated systems with power-law decaying interactions
(2013) [Journal article]We address the problem of orientational order in frustrated interaction systems as a function of the relative range of the competing interactions. We study a spin model Hamiltonian with short-range ferromagnetic interaction ... -
New ordered phases in a class of generalized XY models
(2011) [Journal article]It is well known that the 2D XY model exhibits an unusual infinite order phase transition belonging to the Kosterlitz-Thouless (KT) universality class. Introduction of a nematic coupling into the XY Hamiltonian leads to ... -
Nonequilibrium critical dynamics of the two-dimensional Ashkin-Teller model at the Baxter line
(2017) [Journal article]We investigate the short-time universal behavior of the two-dimensional Ashkin-Teller model at the Baxter line by performing time-dependent Monte Carlo simulations. First, as preparatory results, we obtain the critical ... -
Off-equilibrium dynamics of the frustrated Ising lattice gas
(1999) [Journal article]We study by means of Monte Carlo simulations the off-equilibrium properties of a model glass, the frustrated Ising lattice gas in three dimensions. We have computed typical two times quantities, such as densitydensity ...
