22 citations · 63 across the 5 of their papers we have counts for
5 papers
Energy of bond defects in quantum spin chains obtained from local approximations and from exact diagonalization
V. L. Libero, K. Capelle, F. C. Souza +1
We study the influence of ferromagnetic and antiferromagnetic bond defects on the ground-state energy of antiferromagnetic spin chains. In the absence of translational invariance,…
Density-functional treatment of model Hamiltonians: basic concepts and application to the Heisenberg model
Valter L. Libero, Klaus Capelle
We describe how density-functional theory, well-known for its many uses in ab initio calculations of electronic structure, can be used to study the ground state of inhomogeneous mo…
Spin-density-functional theory: some open problems and application to inhomogeneous Heisenberg models
K. Capelle, Valter L. Libero
Spin-density-functional theory (SDFT) is the most widely implemented and applied formulation of density-functional theory. However, it is still finding novel applications, and occa…
Impurity and boundary effects in one and two-dimensional inhomogeneous Heisenberg antiferromagnets
P. E. G. Assis, Valter L. Libero, K. Capelle
We calculate the ground-state energy of one and two-dimensional spatially inhomogeneous antiferromagnetic Heisenberg models for spins 1/2, 1, 3/2 and 2. Our calculations become pos…
Spin-distribution functionals and correlation energy of the Heisenberg model
Valter L. Libero, K. Capelle
We analyse the ground-state energy and correlation energy of the Heisenberg model as a function of spin, both in the ferromagnetic and in the antiferromagnetic case, and in one, tw…