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dc.contributor.authorSegura, A.es_ES
dc.contributor.authorArtús, Lluíses_ES
dc.contributor.authorCuscó, Ramónes_ES
dc.contributor.authorGoldhahn, R.es_ES
dc.contributor.authorFeneberg, M.es_ES
dc.date.accessioned2017-12-15T08:30:40Z-
dc.date.available2017-12-15T08:30:40Z-
dc.date.issued2017-07-
dc.identifier.citationPhysical Review Materials, 1(2): 024604 (2017)es_ES
dc.identifier.issn2475-9953-
dc.identifier.urihttp://hdl.handle.net/10261/158207-
dc.description.abstractThe electronic structure near the band gap of the corundumlike a phase of Ga2O3 has been investigated by means of optical absorption and spectroscopic ellipsometry measurements in the ultraviolet (UV) range (400-190 nm). The absorption coefficient in the UV region and the imaginary part of the dielectric function exhibit two prominent absorption thresholds with wide but well-defined structures at 5.6 and 6.3 eV which have been ascribed to allowed direct transitions from crystal-field split valence bands to the conduction band. Excitonic effects with large Gaussian broadening are taken into account through the Elliott-Toyozawa model, which yields an exciton binding energy of 110 meV and direct band gaps of 5.61 and 6.44 eV. The large broadening of the absorption onset is related to the slightly indirect character of the material.es_ES
dc.description.sponsorshipThis work has been supported by the Spanish MINECO/FEDER under Contracts No. MAT2015-71035-R and No. MAT2016-75586-C4-1-P. We acknowledge T. Yamaguchi from the Department of Electrical Engineering and Electronics of Kogakuin University, Tokyo, Japan, for supplying us with the samples used in this study.es_ES
dc.language.isoenges_ES
dc.publisherAmerican Physical Societyes_ES
dc.rightsclosedAccesses_ES
dc.subjectThin-filmses_ES
dc.subjectOptical-propertieses_ES
dc.subjectGA2O3 Filmses_ES
dc.subjectBETA-GA2O3es_ES
dc.subjectDepositiones_ES
dc.subjectGrowthes_ES
dc.titleBand gap of corundumlike alpha-Ga2O3 determined by absorption and ellipsometryes_ES
dc.typeartículoes_ES
dc.identifier.doi10.1103/PhysRevMaterials.1.024604-
dc.description.peerreviewedPeer reviewedes_ES
dc.relation.publisherversionhttp://dx.doi.org/10.1103/PhysRevMaterials.1.024604es_ES
dc.contributor.funderMinisterio de Economía y Competitividad (España)es_ES
dc.relation.csices_ES
oprm.item.hasRevisionno ko 0 false*
dc.identifier.funderhttp://dx.doi.org/10.13039/501100003329es_ES
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