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20 papers · 1 filter
Some Global Properties of the Attractive Hubbard Model in the Superconducting Phase: T-Matrix Approximation in 2D
S. Schafroth, J. J. Rodriguez, H. Beck
We have applied the Fast Fourier transform (FFT), which allows to compute efficiently convolution sums, to solve the set of self-consistent T-matrix equations to get the Green func…
Broad Histogram Method
P. M. C. de Oliveira, T. J. P. Penna, H. J. Herrmann
Ferrenberg and Swendsen histogram method is based on Boltzmann probability distribution which presents exponentially decaying tails. Thus, it gives accurate measures only within a…
Finite Nuclei in a Relativistic Mean-Field Model with Derivative Couplings
M. Chiapparini, A. Delfino, M. Malheiro +1
We study finite nuclei, at the mean-field level, using the Zimanyi-Moskowski model and one of its variations (the ZM3 model). We calculate energy levels and ground-state properties…
Exchange Coupling Between Iron Layers Separated by BCC Copper
A. T. Costa, J. d'Albuquerque e Castro, R. B. Muniz +2
The exchange coupling between Fe layers separated by BCC Cu is calculated for Fe/Cu/Fe (001) trilayers. It is shown that the coupling is basically regulated by three extrema of the…
On weak vs. strong universality in the two-dimensional random-bond Ising ferromagnet
F. D. A. Aarão Reis, S. L. A. de Queiroz, Raimundo R. dos Santos
We address the issue of universality in two-dimensional disordered Ising systems, by considering long, finite-width strips of ferromagnetic Ising spins with randomly distributed co…
Dynamics of the Two-Site Hubbard Model
A. T. Costa, M. T. Thomaz
The dynamical evolution of a two-site Hubbard model is derived in the presence of an uniform external magnetic field for a general initial state. The time evolution of the half-fil…