Navegação Ciências Exatas e da Terra por Assunto "Modelo de Anderson"
Resultados 1-12 de 12
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Application of the underscreened Kondo lattice model to neptunium compounds
(2012) [Artigo de periódico]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
(2014) [Artigo de periódico]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
(1997) [Artigo de periódico]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
(2011) [Artigo de periódico]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
(1994) [Artigo de periódico]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
(2013) [Artigo de periódico]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
(2016) [Artigo de periódico]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
(2010) [Artigo de periódico]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
(2017) [Artigo de periódico]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
(2000) [Artigo de periódico]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
(1997) [Artigo de periódico]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
(2011) [Artigo de periódico]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 ...
