L
Luiz N. Oliveira
Researcher at University of São Paulo
Publications - 69
Citations - 2507
Luiz N. Oliveira is an academic researcher from University of São Paulo. The author has contributed to research in topics: Anderson impurity model & Hubbard model. The author has an hindex of 22, co-authored 69 publications receiving 2287 citations. Previous affiliations of Luiz N. Oliveira include Ohio State University & Cornell University.
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Density-functional theory for ensembles of fractionally occupied states. I. Basic formalism.
TL;DR: In this paper, a density functional theory for ensembles of unequally weighted states is formulated on the basis of the generalized Rayleigh-Ritz principle of the preceding paper, and two alternative approaches to the computation of excitation energies are derived, one equivalent to the equiensemble method proposed by Theophilou [J. Phys. C 12, 5419 (1979), the other grounded on an expression relating the excitation energy to the Kohn-Sham single-particle eigenvalues.
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Density-functional theory for superconductors.
TL;DR: In this article, a density-functional theory for superconductors at arbitrary temperature is described, which leads to equations of the Kohn-Sham type, which incorporate exchange and correlation effects into the Bogoliubov-de Gennes equations for an inhomogeneous superconductor.
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Rayleigh-Ritz variational principle for ensembles of fractionally occupied states
TL;DR: In this article, the generalized Rayleigh-Ritz minimization principle is generalized to ensembles of unequally weighted states and an upper bound for the weighted sum is established.
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Density-functional theory for ensembles of fractionally occupied states. II. Application to the He atom.
TL;DR: The two density-functional methods of calculating excitation energies proposed in the preceding paper, combined with the recently formulated quasi-local-density approximation for the equiensemble exchange-correlation energy functional are applied to the He atom.
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Density Functionals Not Based on the Electron Gas: Local-Density Approximation for a Luttinger Liquid
TL;DR: By shifting the reference system for the local-density approximation (LDA) from the electron gas to other model systems, one obtains a new class of density functionals, which by design account for the correlations present in the chosen reference system.