title: Electronic reconstruction at the isopolar LaTiO(3)/LaFeO(3) interface: an X-ray photoemission and density-functional theory study.
abstract: We report the formation of a nonmagnetic band insulator at the isopolar interface between the antiferromagnetic Mott-Hubbard insulator LaTiO_{3} and the antiferromagnetic charge transfer insulator LaFeO_{3}. By density-functional theory calculations, we find that the formation of this interface state is driven by the combination of O band alignment and crystal field splitting energy of the t_{2g} and e_{g} bands. As a result of these two driving forces, the Fe 3d bands rearrange and electrons are transferred from Ti to Fe. This picture is supported by x-ray photoelectron spectroscopy, which confirms the rearrangement of the Fe 3d bands and reveals an unprecedented charge transfer up to 1.2±0.2  e^{-}/interface unit cell in our LaTiO_{3}/LaFeO_{3} heterostructures.
authors.affiliation: Faculty of Science and Technology and MESA+Institute for Nanotechnology, University of Twente, 7500 AE Enschede, Netherlands and Physikalisches Institut, University of Würzburg, 97074 Würzburg, Germany.
authors.forename: J E
authors.initials: JE
authors.lastname: Kleibeuker
authors.affiliation: Institute of Solid State Physics, Vienna University of Technology, A-1040 Vienna, Austria.
authors.forename: Z
authors.initials: Z
authors.lastname: Zhong
authors.affiliation: Faculty of Biology-Oriented Science and Technology, Kinki University, Kinokawa 649-6493, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Nishikawa
authors.affiliation: Physikalisches Institut, University of Würzburg, 97074 Würzburg, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Gabel
authors.affiliation: Physikalisches Institut, University of Würzburg, 97074 Würzburg, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Müller
authors.affiliation: Physikalisches Institut, University of Würzburg, 97074 Würzburg, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Pfaff
authors.affiliation: Physikalisches Institut, University of Würzburg, 97074 Würzburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Sing
authors.affiliation: Institute of Solid State Physics, Vienna University of Technology, A-1040 Vienna, Austria.
authors.forename: K
authors.initials: K
authors.lastname: Held
authors.affiliation: Physikalisches Institut, University of Würzburg, 97074 Würzburg, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Claessen
authors.affiliation: Faculty of Science and Technology and MESA+Institute for Nanotechnology, University of Twente, 7500 AE Enschede, Netherlands.
authors.forename: G
authors.initials: G
authors.lastname: Koster
authors.affiliation: Faculty of Science and Technology and MESA+Institute for Nanotechnology, University of Twente, 7500 AE Enschede, Netherlands.
authors.forename: G
authors.initials: G
authors.lastname: Rijnders
mesh_terms: D004583:Electrons; D007811:Lanthanum / Q000737:chemistry*; D008956:Models, Chemical; D010087:Oxides / Q000737:chemistry*; D056951:Photoelectron Spectroscopy / Q000379:methods; D014025:Titanium / Q000737:chemistry*
chemical_list: D010087:Oxides; C518665:lanthanum iron oxide; C009495:titanium dioxide; D007811:Lanthanum; D014025:Titanium