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  • Loreto, R. P.; Gonçalves, R. S.; Pereira, A. R.; Araujo, C. I. L. de; Nascimento, F. S.; Borme, J.; Cezar, J. C.; Nisoli, C. (Journal of Physics: Condensed Matter, 2019)
    In this work, we explore a kind of geometrical effect in the thermodynamics of artificial spin ices (ASI). In general, such artificial materials are athermal. Here, We demonstrate that geometrically driven dynamics in ASI ...
  • Fernandes, R. L.; Lopes., R. J. C; Pereira, A. R (Solid State Communications, 2019-03)
    We have investigated (numerically) skyrmions constituted by two merons in two-dimensional Heisenberg antiferromagnets. The behavior and stability of these topological pseudo-particles are analyzed in discrete and finite ...
  • Rodrigues, Nathann T; Oliveira, Tiago J (Journal of Physics A: Mathematical and Theoretical, 2014)
    We study a generalized interacting self-avoiding walk (ISAW) model with nearest- and next nearest-neighbor (NN and NNN) interactions on square and cubic lattices. In both dimensions, the phase diagrams show coil and globule ...
  • Moura, A. R.; Lopes, R. J. C. (Journal of Magnetism and Magnetic Materials, 2019-02-15)
    We used the Self-Consistent Harmonic Approximation (SCHA) to study the thermodynamics of the precession magnetization in a two-dimensional isotropic ferromagnet. The SCHA treats the Hamiltonian in terms of the canonically ...
  • Fonseca, Jakson M.; Moura-Melo, Winder A.; Pereira, Afranio R.; Carvalho-Santos, Vagson L. (The European Physical Journal B, 2016-06)
    An effective Hamiltonian describing the surface states of a toroidal topological insulator is obtained, and it is shown to support both bound-states and charged zero-modes. Actually, the spin connection induced by the ...
  • Gomes, Joaquim P.; Felix, Jorlandio F.; Mondal, Sanjib; Ghosh, Anupam; Gobato, Y. Galvão; Galeti, H. V. Avanço; Choudhuri, B.; Dwivedi, S. M. M. Dhar; Henini, M.; Mondal, Aniruddha; Piton, M. Rizzo (Journal of Materials Science: Materials in Electronics, 2018-11)
    We have investigated the electrical and optical properties of erbium (Er3+) doped TiO2 thin films (Er:TiO2 TFs) grown by sol–gel technique on glass and silicon substrates. The samples were characterized by field emission ...
  • Morales, Ivan; Neves, Bruno; Oporto, Zui; Piguet, Olivier (Symmetry, 2018)
    We revisit the classical theory of a relativistic massless charged point particle with spin and interacting with an external electromagnetic field. In particular, we give a proper definition of its kinetic energy and its ...
  • Dias, Rafael F.; Costa, Cleidineia C. da; Manhabosco, Taise M.; Oliveira, Alan B. de; Matos, Matheus J. S.; Soares, Jaqueline S.; Batista, Ronaldo J. C. (Chemical Physics Letters, 2019-01-16)
    We employed PBE and BLYP semi-local functionals and the van der Waals density functional of Dion et al. (2004) (vdW-DF) to investigate structural properties of liquid acetonitrile and methanol. Among those functionals the ...
  • Rojas, Onofre; Souza, Sérgio M. de; Moura-Melo, Winder A. (Physica A: statistical mechanics and its applications, 2007-01-01)
    Thermodynamical properties of spin-S Ising chains can nowadays be easily obtained using numerical calculation. However, from a mathematical point of view, its exact solution for arbitrary spin is still a challenge. Only ...
  • Pereira, A. R.; Pires, A. S. T.; Moura, A. R. (Journal of Magnetism and Magnetic Materials, 2014-05)
    In this paper we study the influence of the single-ion anisotropy in the two-dimensional biquadratic Heisenberg model (ABHM) on the square lattice at zero and finite low temperatures. It is common to represent the bilinear ...
  • Morales, Ivan; Neves, Bruno; Oporto, Zui; Piguet, Olivier (The European Physical Journal C, 2016-04)
    In this paper we consider a model for gravity in four-dimensional space-time originally proposed by Chamseddine, which may be derived by dimensional reduction and truncation from a five-dimensional Chern–Simons theory. Its ...
  • Morales, Ivan; Neves, Bruno; Oporto, Zui; Piguet, Olivier (The European Physical Journal C, 2017-02)
    Five-dimensional Chern–Simons theory with (anti-)de Sitter SO(1,5) or SO(2,4) gauge invariance presents an alternative to general relativity with cosmological constant. We consider the zero modes of its Kaluza–Klein ...
  • Martins, Marcelo Lobato; Sales, J. A. de; Moreira, J. G. (Journal of Physics A: Mathematical and General, 1999-02-12)
    We propose a method to detect phase transitions in discrete lattice models based on the roughness exponent. This approach is applied to the one-dimensional Domany-Kinzel cellular automaton (CA). Our results, obtained by ...
  • Ferreira, Sukarno Olavo; Casarin, Letícia Sopeña; Casarin, Fabrício de Oliveira; Brandelli, Adriano; Novello, Júnia; Tondo, Eduardo Cesar (LWT - Food Science and Technology, 2016-06)
    Bacterial attachment to stainless steels AISI (American Iron and Steel Institute) 304 and 316, the preferred material choices for food equipment, is a very important food safety consideration. The purpose of the present ...
  • Felix, J. F.; Cunha, D. L. da; Pereira, G. F. C.; Aguiar, J. Albino; Azevedo, W. M. de (Materials Research Bulletin, 2014-01)
    This article presents a chemical bottom-up synthesis of highly crystalline and nanostructured hydrocerussite (Pb3(CO3)2(OH)2) with hexagonal morphology prepared by laser ablation in liquid. The results demonstrate that is ...
  • Mansur Filho, J. C.; Silva, A. G.; Carvalho, A. T. G.; Martins, M. L. (Physica A: Statistical Mechanics and its Applications, 2005-05-25)
    We report some experimental results for quasi-two-dimensional electrocrystallization of copper under magnetic fields. Such results are theoretically investigated by large scale simulations of a DLA-like model in which ...
  • Freitas, Walter A.; Moura-Melo, Winder A.; Pereira, A. R. (Physics Letters A, 2005-03-14)
    This work is devoted to the study of how spin texture excitations are affected by the presence of a static non-magnetic impurity whenever they lie on a conical support. We realize a number of novelties as compared to the ...
  • Brandao, Mariana P.; Gouvea Neto, Marina; Anjos, Virgílio de Carvalho dos; Bell, Maria José V. (Food Control, 2017-06-07)
    The increasing importance of goat milk renews the need to examine the authenticity of goat milk powder and to identify frauds with cow milk powder. The use of front-face and time-resolved fluorescence techniques to identify ...
  • Moura-Melo, W. A.; Pereira, A. R.; Mól, L. A. S.; Pires, A. S. T. (Physics Letters A, 2007-01-01)
    We study magnetic vortex-like excitations lying on a conic space background. Two types of them are obtained. Their energies appear to be linearly dependent on the conical aperture parameter, besides of being logarithmically ...
  • Belo, L. R. A.; Oliveira Neto, N. M.; Moura Melo, W. A.; Pereira, A. R.; Ercolessi, Elisa (Physics Letters A, 2007-06-11)
    Heisenberg-like spins lying on the pseudosphere (a 2-dimensional infinite space with constant negative curvature) cannot give rise to stable soliton solutions. Only fractional solutions can be stabilized on this surface ...

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