132 citations · 326 across the 11 of their papers we have counts for
11 papers
Ground-states of spin-1 bosons in asymmetric double-wells
D. W. S. Carvalho, A. Foerster, M. A. Gusmão
In this work we investigate the different states of a system of spin-1 bosons in two potential wells connected by tunneling, with spin-dependent interaction. The model utilizes the…
Critical exponents of the disorder-driven superfluid-insulator transition in one-dimensional Bose-Einstein condensates
J. C. C. Cestari, A. Foerster, M. A. Gusmão +1
We investigate the nature of the superfluid-insulator quantum phase transition driven by disorder for non-interacting ultracold atoms on one-dimensional lattices. We consider two d…
Finite-size effects in Anderson localization of one-dimensional Bose-Einstein condensates
J. C. C. Cestari, A. Foerster, M. A. Gusmão
We investigate the disorder-induced localization transition in Bose-Einstein condensates for the Anderson and Aubry-Andre models in the non-interacting limit using exact diagonaliz…
Magnetic and orbital ordering of RuO2 planes in RuSr2(Eu,Gd)Cu2O8
A. A. Aligia, M. A. Gusmao
We start from an effective Hamiltonian for Ru ions in a square lattice, which includes the on-site interactions between t_2g orbitals derived from Coulomb repulsion, and a tetragon…
Disorder effects at low temperatures in La_{0.7-x}Y_{x}Ca_{0.3}MnO_{3} manganites
M. A. Gusmao, L. Ghivelder, R. S. Freitas +4
With the aim of probing the effect of magnetic disorder in the low-temperature excitations of manganites, specific-heat measurements were performed in zero field, and in magnetic f…
Band-filling effects on the Kondo-lattice properties
B. Coqblin, C. Lacroix, M. A. Gusmão +1
We present theoretical results for a Kondo-lattice model with spin-1/2 localized moments, including both the intrasite Kondo coupling and an intersite antiferromagnetic exchange in…