Now showing items 1-12 of 12

    • Application of the underscreened Kondo lattice model to neptunium compounds 

      Thomas, Christopher; Simoes, Acirete Souza da Rosa; Iglesias, Jose Roberto; Lacroix, Claudine; Coqblin, Bernard (2012) [Journal article]
      The coexistence of Kondo e®ect and ferromagnetic order has been observed in many uranium and neptunium compounds such as UTe or Np2PdGa3. This coexistence can be described within the underscreened Anderson lattice model ...
    • Band-filling and disorder effects in the ordered phase of the Falicov-Kimball model 

      Carvalho, Rubens Diego Barbosa de; Gusmao, Miguel Angelo Cavalheiro (2014) [Journal article]
      We investigate the stability of “magnetic” ordering against band-filling changes and Anderson-like disorder in the Falicov-Kimball model, within dynamical mean-field theory (DMFT). The one-particle density of states is ...
    • Bohm-Aharonov and Kondo effects on tunneling currents in a mesoscopic ring 

      Davidovich, Maria Augusta; Anda, Enrique V.; Iglesias, Jose Roberto; Chiappe, Giuseppe (1997) [Journal article]
      We present an analysis of the Kondo effect on the Bohm-Aharonov oscillations of the tunneling currents in a mesoscopic ring with a quantum dot inserted in one of its arms. The system is described by an Andersonimpurity ...
    • Critical exponents of the disorder-driven superfluid-insulator transition in one-dimensional Bose-Einstein condensates 

      Cestari, Jardel Caminha Carvalho; Foerster, Angela; Gusmao, Miguel Angelo Cavalheiro; Continentino, Mucio Amado (2011) [Journal article]
      We investigate the nature of the superfluid-insulator quantum phase transition driven by disorder for noninteracting ultracold atoms on one-dimensional lattices. We consider two different cases: Anderson-type disorder, ...
    • Cumulant expansion of the periodic Anderson model : general derivation 

      Figueira, M.S.; Foglio, M.E.; Martinez Pino, Gerardo Guido (1994) [Journal article]
      We extend to the periodic Anderson model (PAM) the diagrammatic expansion in cumulants that was employed by Hubbard to study his model of a narrow band of strongly correlated electrons. The PAM is a lattice of localized ...
    • Effects of band filling in the Anderson-Falicov-Kimball model 

      Carvalho, Rubens Diego Barbosa de; Gusmao, Miguel Angelo Cavalheiro (2013) [Journal article]
      In this work, we study the Anderson-Falicov-Kimball model within the dynamical mean field theory for the Bethe lattice, restricting our analysis to the nonmagnetic case. The one-particle density of states is obtained by ...
    • Fate of topological states in incommensurate generalized Aubry-André models 

      Cestari, Jardel Caminha Carvalho; Foerster, Angela; Gusmao, Miguel Angelo Cavalheiro (2016) [Journal article]
      We study one-dimensional optical lattices described by generalized Aubry-André models that include both commensurate and incommensurate modulations of the hopping amplitude. This brings together two interesting features ...
    • Finite-size effects in Anderson localization of one-dimensional Bose-Einstein condensates 

      Cestari, Jardel Caminha Carvalho; Foerster, Angela; Gusmao, Miguel Angelo Cavalheiro (2010) [Journal article]
      We investigate the disorder-induced localization transition in Bose-Einstein condensates for the Anderson and Aubry-Andr´e models in the noninteracting limit using exact diagonalization. We show that, in addition to the ...
    • Level compressibility for the Anderson model on regular random graphs and the eigenvalue statistics in the extended phase 

      Metz, Fernando Lucas; Pérez-Castillo, Isaac (2017) [Journal article]
      We calculate the level compressibility χ(W,L) of the energy levels inside [−L/2,L/2] for the Anderson model on infinitely large random regular graphs with on-site potentials distributed uniformly in [−W/2,W/2]. We show ...
    • Phase diagram for the Anderson lattice model 

      Bernhard, Ben Hur; Lacroix, Claudine; Iglesias, Jose Roberto; Coqblin, Bernard (2000) [Journal article]
      We study the competition between the Kondo effect and the Ruderman-Kittel-Kasuya-Yosida interaction in the framework of the Anderson lattice model with an extra intersite exchange term. By using an approximation based on ...
    • Simplified periodic anderson model : exact solution in infinite dimensions 

      Consiglio, Roberto; Gusmao, Miguel Angelo Cavalheiro (1997) [Journal article]
      We present a diagrammatic perturbative treatment of the hybridization for the periodic Anderson model that recovers the dynamical mean-field equations in the limit of infinite dimensions. The resulting effective singlesite ...
    • The S=1 underscreened anderson lattice model for uranium compounds 

      Thomas, Christopher; Simoes, Acirete Souza da Rosa; Iglesias, Jose Roberto; Lacroix, Claudine; Perkins, Natalia B.; Coqblin, Bernard (2011) [Journal article]
      Magnetic properties of uranium and neptunium compounds showing coexistence of the Kondo e®ect and ferromagnetic order are investigated within the degenerate Anderson Lattice Hamiltonian, describing a 5f2 electronic ...