Local order and magnetic field effects on the electronic properties of disordered binary alloys in the quantum site percolation limit

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dc.contributor.authorMello, Denise Fernandes de [UNESP]
dc.contributor.authorCabrera, G. G.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.date.accessioned2014-05-20T15:19:49Z
dc.date.available2014-05-20T15:19:49Z
dc.date.issued1999-12-01
dc.description.abstractElectronic properties of disordered binary alloys are studied via the calculation of the average Density of States (DOS) in two and three dimensions. We propose a new approximate scheme that allows for the inclusion of local order effects in finite geometries and extrapolates the behavior of infinite systems following finite-size scaling ideas. We particularly investigate the limit of the Quantum Site Percolation regime described by a tight-binding Hamiltonian. This limit was chosen to probe the role of short range order (SRO) properties under extreme conditions. The method is numerically highly efficient and asymptotically exact in important limits, predicting the correct DOS structure as a function of the SRO parameters. Magnetic field effects can also be included in our model to study the interplay of local order and the shifted quantum interference driven by the field. The average DOS is highly sensitive to changes in the SRO properties and striking effects are observed when a magnetic field is applied near the segregated regime. The new effects observed are twofold: there is a reduction of the band width and the formation of a gap in the middle of the band, both as a consequence of destructive interference of electronic paths and the loss of coherence for particular values of the magnetic field. The above phenomena are periodic in the magnetic flux. For other limits that imply strong localization, the magnetic field produces minor changes in the structure of the average DOS. © World Scientific Publishing Company.en
dc.description.affiliationDepartamento de Física Faculdade de Ciências Universidade Estadual Paulista (UNESP), G. P. 473, Bauru 17033-360, SP
dc.description.affiliationUnespDepartamento de Física Faculdade de Ciências Universidade Estadual Paulista (UNESP), G. P. 473, Bauru 17033-360, SP
dc.format.extent3861-3877
dc.identifierhttp://dx.doi.org/10.1142/S0217979299004057
dc.identifier.citationInternational Journal of Modern Physics B, v. 13, n. 32, p. 3861-3877, 1999.
dc.identifier.doi10.1142/S0217979299004057
dc.identifier.issn0217-9792
dc.identifier.scopus2-s2.0-27844520451
dc.identifier.urihttp://hdl.handle.net/11449/130481
dc.identifier.wosWOS:000088023100003
dc.language.isoeng
dc.publisherWorld Scientific Publ Co Pte Ltd
dc.relation.ispartofInternational Journal of Modern Physics B
dc.relation.ispartofjcr0.769
dc.relation.ispartofsjr0,249
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.titleLocal order and magnetic field effects on the electronic properties of disordered binary alloys in the quantum site percolation limiten
dc.typeArtigo
dcterms.licensehttp://www.worldscientific.com/page/authors/author-rights
dcterms.rightsHolderWorld Scientific Publ Co Pte Ltd
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências, Baurupt
unesp.departmentFísica - FCpt

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