The statistical three-state model is proposed to describe the ordering of triangular TMA
molecules into flower phases. The model is solved on a rescaled triangular lattice, assuming …

An XY model, generalized by inclusion of up to an infinite number of higher-order pairwise
interactions with an exponentially decreasing strength, is studied by spin-wave theory and …

We investigate the phase-ordering dynamics of the incompressible Toner-Tu equation in
three dimensions. We show that the phase ordering proceeds via defect merger events and …

I study effects of q-order antinematic (AN q) interactions on the critical behavior of the
antiferromagnetic (AF) XY model on a square lattice. It is found that the evolution of the …

A bstract We consider the 2d XY Model with topological lattice actions, which are invariant
against small deformations of the field configuration. These actions constrain the angle …

Critical properties of the two-dimensional XY model involving solely nematic-like terms of the
second and third orders are investigated by spin-wave analysis and Monte Carlo simulation …

We show that the order-disorder phase transition in the three-state Potts ferromagnet on a
square lattice is driven by a coupled proliferation of domain walls and vortices. Raising the …

We study a two-dimensional generalized XY model that depends on an integer q by the
Monte Carlo method. This model was recently proposed by Romano and Zagrebnov. We …

A dissertação discute a existência de defeitos topológicos tipo vórtices BPS (do tipo
Abrikosov-Nielsen-Olesen) em modelos de calibre abelianos possuindo altas derivadas no …

We study the problem of ensemble equivalence in spin systems with short-range
interactions under the existence of a first-order phase transition. The spherical model with …