R
Ricardo Nunes
Researcher at Universidade Federal de Minas Gerais
Publications - 68
Citations - 2526
Ricardo Nunes is an academic researcher from Universidade Federal de Minas Gerais. The author has contributed to research in topics: Graphene & Boron nitride. The author has an hindex of 23, co-authored 65 publications receiving 2354 citations. Previous affiliations of Ricardo Nunes include Rutgers University & United States Naval Research Laboratory.
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Density-matrix electronic-structure method with linear system-size scaling.
TL;DR: A method is introduced for the solution of the electronic-structure problem in the independent-electron approximation based upon a variational solution for the density matrix, which is truncated to zero beyond a real-space radius R c and becomes exact as R c →∞.
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Berry-phase treatment of the homogeneous electric field perturbation in insulators
Ricardo Nunes,Xavier Gonze +1 more
TL;DR: A perturbation theory of the static response of insulating crystals to homogeneous electric fields that combines the modem theory of polarization (MTP) with the variation-perturbation framework is developed at the unrestricted order of perturbations in this article.
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Generalization of the density-matrix method to a nonorthogonal basis.
Ricardo Nunes,David Vanderbilt +1 more
TL;DR: A generalization of the Li, Nunes, and Vanderbilt density-matrix method to the case of a nonorthogonal set of basis functions, showing the generalized energy functional to be variational with respect to the elements of the density matrix.
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Electronic structure and energetics ofBxCyNzlayered structures
TL;DR: Mario S. C. Mazzoni, R. W. Nunes, Sergio Azevedo,1,2 and H. Chacham are the first authors to report on the use of e-cigarettes in Feira de Santana and their effects on the response of the immune system.
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Period-doubled structure for the 90 partial dislocation in silicon
TL;DR: In this paper, the authors suggest that the commonly accepted core structure of the 90 − partial dislocation in Si may not be correct, and propose instead a period-doubled structure.