dc.creator | Jiménez Calzado, Carmen | es |
dc.creator | Cruz Hernández, Norge | es |
dc.creator | Fernández Sanz, Javier | es |
dc.date.accessioned | 2016-10-26T12:43:35Z | |
dc.date.available | 2016-10-26T12:43:35Z | |
dc.date.issued | 2008 | |
dc.identifier.citation | Jiménez Calzado, C., Cruz Hernández, N. y Fernández Sanz, J. (2008). Effect of on-site Coulomb repulsion term U on the band-gap states of the reduced rutile (110) TiO2 surface. Physical Review B - Condensed Matter and Materials Physics, 77 (4), 0451181-04511810. | |
dc.identifier.issn | 1098-0121 | es |
dc.identifier.uri | http://hdl.handle.net/11441/48187 | |
dc.description.abstract | We present a study concerning the effect of the on site d-d Coulomb interaction energy U on the band-gap
states of nonstoichiometric rutile 110 TiO2 surface. As well known, the excess electrons resulting from the
formation of oxygen vacancies localize on the Ti 3d orbitals forming band-gap states. Local density approximation
LDA does not give a correct description of these band-gap states, either with or without gradient
corrections. The failure of LDA is often attributed to an inadequate treatment of electron correlation in systems
with localized orbitals and is commonly corrected with an empirical local Coulomb repulsion term, i.e., the
LDA+U method. This study provides a completely general strategy to estimate the U value in this kind of
systems, illustrated here for reduced 110 TiO2 surface, well characterized from experiments. From ab initio
embedded cluster configuration interaction calculations, combined with the effective Hamiltonian theory, a
value of U of 5.5±0.5 eV is obtained, in good agreement with those reported for this system from x-ray
photoemission spectroscopy experiments U=4.5±0.5 eV . It is observed that when the ab initio estimate of U
is injected into the periodic LDA+U calculations, a correct description of the gap states is obtained from the
periodic LDA+U calculations. Additionally, the results indicate that the position of these states on the band
gap strongly depends on the level at which lattice relaxation is taken into account, with significant differences
between the density of states curves at the LDA+U level obtained using the optimal generalized gradient
approximation or LDA+U geometries. These results suggest that this combined strategy could be a useful tool
for those systems where electron correlation plays a key role, and no experimental data are available for the
on-site Coulomb repulsion | es |
dc.format | application/pdf | es |
dc.language.iso | eng | es |
dc.publisher | American Physical Society | es |
dc.relation.ispartof | Physical Review B - Condensed Matter and Materials Physics, 77 (4), 0451181-04511810. | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.title | Effect of on-site Coulomb repulsion term U on the band-gap states of the reduced rutile (110) TiO2 surface | es |
dc.type | info:eu-repo/semantics/article | es |
dcterms.identifier | https://ror.org/03yxnpp24 | |
dc.type.version | info:eu-repo/semantics/publishedVersion | es |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.contributor.affiliation | Universidad de Sevilla. Departamento de Química Física | es |
dc.relation.publisherversion | 10.1103/PhysRevB.77.045118 | es |
dc.identifier.doi | 10.1103/PhysRevB.77.045118 | es |
idus.format.extent | 10 p. | es |
dc.journaltitle | Physical Review B - Condensed Matter and Materials Physics | es |
dc.publication.volumen | 77 | es |
dc.publication.issue | 4 | es |
dc.publication.initialPage | 0451181 | es |
dc.publication.endPage | 04511810 | es |
dc.identifier.idus | https://idus.us.es/xmlui/handle/11441/48187 | |