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In search of the potential realization of novel normal-state phases on thesurface of Sr2RuO4 - those stemming from either topological bulk properties orthe interplay between spin-orbit coupling (SO) and the broken symmetry of thesurface - we revisit the electronic structure of the top-most layers by ARPESwith improved data quality as well as ab-initio LDA slab calculations. We findthat the current model of a single surface layer (\surd2x\surd2)R45{\deg}reconstruction does not explain all detected features. The observeddepth-dependent signal degradation, together with the close quantitativeagreement with LDA+SO slab calculations based on the LEED-determined surfacecrystal structure, reveal that (at a minimum) the sub-surface layer alsoundergoes a similar although weaker reconstruction. This points to asurface-to-bulk progression of the electronic states driven by structuralinstabilities, with no evidence for Dirac and Rashba-type states or surfacemagnetism.

physical review letters

Determining the Surface-To-Bulk Progression in the Normal-State  Electronic Structure of Sr2RuO4 by Angle-Resolved Photoemission and Density  Functional Theory