We study the Heisenberg model on cylindrically symmetric curved surfaces. Two kinds of
excitations are considered. The first is given by the isotropic regime, yielding the sine …

We study the nonlinear σ-model in an external magnetic field applied on curved surfaces
with rotational symmetry. The Euler–Lagrange equations derived from the Hamiltonian yield …

We obtain a half-skyrmion solution in the orientation of Heisenberg spins on a neck joining
two planes with a semi-circular region. In addition, we consider several geometries …

In this work we study the effects of the geometry and topology of a cylinder on the energy
levels of an electron moving in a homogeneous magnetic field. We consider the existence of …

We study the Heisenberg model in an external magnetic field on curved surfaces with
rotational symmetry. The Euler–Lagrange static equations, derived from the Hamiltonian …

Neste trabalho revisamos alguns dos sistemas não-lineares mais paradigmáticos e
desvendamos algumas das suas surpreendentes interligações. Os problemas de interesse …