title: Determining the surface-to-bulk progression in the normal-state electronic structure of Sr(2)RuO(4) by angle-resolved photoemission and density functional theory.
abstract: We revisit the normal-state electronic structure of Sr(2)RuO(4) by angle-resolved photoemission spectroscopy with improved data quality, as well as ab initio band structure calculations in the local-density approximation with the inclusion of spin-orbit coupling. We find that the current model of a single surface layer (√2×√2)R45° reconstruction does not explain all detected features. The observed depth-dependent signal degradation, together with the close quantitative agreement with the slab calculations based on the surface crystal structure as determined by low-energy electron diffraction, reveal that-at a minimum-the subsurface layer also undergoes a similar although weaker reconstruction. This model accounts for all features-a key step in understanding the electronic structure-and indicates a surface-to-bulk progression of the electronic states driven by structural instabilities. Finally, we find no evidence for other phases stemming from either topological bulk properties or, alternatively, the interplay between spin-orbit coupling and the broken symmetry of the surface.
authors.affiliation: Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: C N
authors.initials: CN
authors.lastname: Veenstra
authors.forename: Z-H
authors.initials: ZH
authors.lastname: Zhu
authors.forename: B
authors.initials: B
authors.lastname: Ludbrook
authors.forename: M
authors.initials: M
authors.lastname: Capsoni
authors.forename: G
authors.initials: G
authors.lastname: Levy
authors.forename: A
authors.initials: A
authors.lastname: Nicolaou
authors.forename: J A
authors.initials: JA
authors.lastname: Rosen
authors.forename: R
authors.initials: R
authors.lastname: Comin
authors.forename: S
authors.initials: S
authors.lastname: Kittaka
authors.forename: Y
authors.initials: Y
authors.lastname: Maeno
authors.forename: I S
authors.initials: IS
authors.lastname: Elfimov
authors.forename: A
authors.initials: A
authors.lastname: Damascelli