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cond-mat.str-el2010
Effects of lattice defects in graphene on the scattering of Charge Carriers
Jakson M. Fonseca, Winder A. Moura-Melo, Afranio R. Pereira
We study the scattering of graphene quasiparticles by topological defects, represented by holes, pentagons and heptagons. For the case of holes, we obtain the phase shift and found…
cond-mat.str-el2004
Diluted planar ferromagnets: nonlinear excitations on a non-simply connected manifold
Fagner M. Paula, Afranio R. Pereira, Lucas A. S. Mól
We study the behavior of magnetic vortices on a two-dimensional support manifold being not simply connected. It is done by considering the continuum approach of the XY-model on a p…
cond-mat.str-el2004
Heisenberg Spins on a Circular Conical Surface
Afranio Rodrigues Pereira
We investigate classical Heisenberg spins on a conical surface. The energy and configuration of non-trivial spin distributions are obtained using a non-conventional method based on…