INVESTIGADORES
RAMIREZ PASTOR antonio Jose
artículos
Título:
Ground State Entropy of ± J Ising Lattices by Monte Carlo Simulations
Autor/es:
F. ROMÁ; F. NIETO; E. E. VOGEL; A. J. RAMIREZ-PASTOR
Revista:
JOURNAL OF STATISTICAL PHYSICS
Editorial:
Springer
Referencias:
Lugar: Netherlands; Año: 2004 vol. 114 p. 1325 - 1341
ISSN:
0022-4715
Resumen:
An accurate numerical calculation of the ground-state entropyassociated to two- dimensional ±J Ising lattices is presented.Themethod is based on the use of the thermodynamic integrationmethod.Total energy is calculated by means of the Monte Carlomethod.Then the entropy (or degeneracy)of a state of interest isobtained by using thermodynamic integration starting at a knownreference state.Results for small sizes are compared to exactvalues obtained by exhaustive scanning of the entire ground-statemanifold,which serves as a test for the reliability of thesimulation model developed here.The close agreement betweensimulated and exact results for energy and remnant entropysupports the validity of the technique used for describing theproperties of ±J Ising lattices at the fundamentallevel.Finally,the results are extrapolated in order to estimatetendencies for larger systems.
