Surface and bulk electronic structure of unconventional superconductor Sr_2RuO_4: unusual splitting of the beta-band

Abstract

We present an angle resolved photoemission study of the surface and bulk electronic structure of the single layer ruthenate Sr${}_2$RuO${}_4$. As the early studies of its electronic structure by photoemission and scanning tunneling microscopy were confronted with a problem of surface reconstruction, surface aging was previously proposed as a possible remedy to access the bulk states. Here we suggest an alternative way by demonstrating that, in the case of Sr${}_2$RuO${}_4$, circularly polarised light can be used to disentangle the signals from the bulk and surface layers, thus opening the possibility of investigating many-body interactions both in bulk and surface bands. The proposed procedure results in improved momentum resolution, which enabled us to detect an unexpected splitting of the surface $\beta$ band. We propose that spin--orbit splitting might be responsible for this, and discuss possible relations of the newly observed surface feature to topological matter.

Submitted to PRB. Related work: http://www.ifw-dresden.de/institutes/iff/research/SC/arpes

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Cited by in corpus (12)

• Hallmarks of Hund's coupling in the Mott insulator Ca${}_2$RuO${}_4$
• Determining the Surface-To-Bulk Progression in the Normal-State Electronic Structure of Sr2RuO4 by Angle-Resolved Photoemission and Density Functional Theory
• ARPES experiment in fermiology of quasi-2D metals (Review Article)
• Quasiparticle Interference and Strong Electron-Mode Coupling in the Quasi-One-Dimensional Bands of Sr${}_2$RuO${}_4$
• Unveiling unconventional magnetism at the surface of Sr${}_2$RuO${}_4$
• Structural and electronic properties of Sr2RuO4-Sr3Ru2O7 heterostructure
• Orbitally selective breakdown of Fermi liquid quasiparticles in Ca${}_{1.8}$Sr${}_{0.2}$RuO${}_4$
• Chemical and valence reconstruction at the surface of SmB6 revealed with resonant soft x-ray reflectometry
• Electric field driven octahedral rotation in perovskite
• Unusual Fermi Surface Sheet-Dependent Band Splitting in Sr2RuO4 Revealed by High Resolution Angle-Resolved Photoemission
• Charge transfer model for the electronic structure of layered ruthenates
• The Future of the Correlated Electron Problem