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6 papers · 1 filter
Magnetization of Planar Four-Fermion Systems
Heron Caldas, Rudnei O. Ramos
We consider a planar system of fermions, at finite temperature and density, under a static magnetic field parallel to the two-dimensional plane. This magnetic field generates a Zee…
Orientational order in two dimensions from competing interactions at different scales
Daniel G. Barci, Daniel A. Stariolo
We discuss orientational order in two dimensions in the context of systems with competing isotropic interactions at different scales. We consider an extension of the Brazovskii mod…
Critical Dopant Concentration in Polyacetylene and Phase Diagram from a Continuous Four-Fermi Model
Heron Caldas, Jean-Loic Kneur, Marcus B. Pinto +1
The Optimized Perturbation Theory (OPT) method, at finite temperature and finite chemical potential, is applied to the field theory model for polyacetylene. The critical dopant con…
Critical temperature for first-order phase transitions in confined systems
C. A. Linhares, A. P. C. Malbouisson, Y. W. Milla +1
We consider the Euclidean -dimensional () model with () compactified dimensions. Introducing temperature by means of the Ginzburg--Landau p…
Competing Interactions, the Renormalization Group and the Isotropic-Nematic Phase Transition
Daniel G. Barci, Daniel A. Stariolo
We discuss 2D systems with Ising symmetry and competing interactions at different scales. In the framework of the Renormalization Group, we study the effect of relevant quartic int…
Asymptotically Improved Convergence of Optimized Perturbation Theory in the Bose-Einstein Condensation Problem
Jean-Loic Kneur, Marcus B. Pinto, Rudnei O. Ramos
We investigate the convergence properties of optimized perturbation theory, or linear expansion (LDE), within the context of finite temperature phase transitions. Our results p…