6 papers
Slowdown of nonequilibrium dynamics in gapped `qubit' chains
D. Tygel, J. G. Carvalho, G. G. Cabrera
We solve the nonequilibrium dynamics of qubits or quantum spin chains (s=1/2) modeled by an anisotropic XY Hamiltonian, when the initial condition is prepared as a spatially inhomo…
Commensurability Transition and Stripe Phases in the Ginzburg-Landau Theory
B. Uchoa, G. G. Cabrera
We phenomenologically describe the thermodynamics of charge and spin density waves in doped high- oxides. We have explicitly calculated stable non-homogeneous solutions in t…
A Coulomb gas approach to the anisotropic one-dimensional Kondo lattice model at arbitrary filling
E. Novais, E. Miranda, A. H. Castro Neto +1
We establish a mapping of a general spin-fermion system in one dimension into a classical generalized Coulomb gas. This mapping allows a renormalization group treatment of the anis…
Phase diagram of the anisotropic Kondo chain
E. Novais, E. Miranda, A. H. Castro Neto +1
We establish the phase diagram of the one-dimensional anisotropic Kondo lattice model at T=0 using a generalized two-dimensional classical Coulomb gas description. We analyze the p…
Local order and magnetic field effects on the electronic properties of disordered binary alloys in the Quantum Site Percolation limit
D. F. de Mello, G. G. Cabrera
Electronic properties of disordered binary alloys are studied via the calculation of the average Density of States (DOS) in two and three dimensions. We propose a new approximate s…
Diamagnetic Effects, Spin Dependent Fermi Surfaces, and the Giant Magnetoresistance in Metallic Multilayers
W. Tavera, G. G. Cabrera
We study the role of diamagnetic effects on the transport properties of metallic magnetic multilayers to elucidate whether they can explain the Giant Magnetoresistance (GMR) effect…