Hierarchy of Lifshitz transitions in the surface electronic structure of Sr${}_2$RuO${}_4$ under uniaxial compression

Abstract

We report the evolution of the electronic structure at the surface of the layered perovskite Sr${}_2$RuO${}_4$ under large in-plane uniaxial compression, leading to anisotropic $B_{1g}$ strains of ${\epsilon }_{xx}-{\epsilon }_{yy}=-0.9\pm 0.1\%$. From angle-resolved photoemission, we show how this drives a sequence of Lifshitz transitions, reshaping the low-energy electronic structure and the rich spectrum of van Hove singularities that the surface layer of Sr${}_2$RuO${}_4$ hosts. From comparison to tight-binding modelling, we find that the strain is accommodated predominantly by bond-length changes rather than modifications of octahedral tilt and rotation angles. Our study sheds new light on the nature of structural distortions at oxide surfaces, and how targeted control of these can be used to tune density of states singularities to the Fermi level, in turn paving the way to the possible realisation of rich collective states at the Sr${}_2$RuO${}_4$ surface.

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Cited by in corpus (10)

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• Spin-orbit coupling induced Van Hove singularity in proximity to a Lifshitz transition in Sr${}_4$Ru${}_3$O${}_{10}$
• Magic angle of Sr${}_2$RuO${}_4$: Optimizing correlation-driven superconductivity
• Uniaxial stress effect on the electronic structure of quantum materials
• Negatively enhanced thermopower near a Van Hove singularity in electron-doped Sr${}_2$RuO${}_4$
• Anomalous Fermi pockets on Hund's metal surface of Sr2RuO4 induced by the correlation-enhanced spin-orbit coupling
• Why Scanning Tunneling Microscopy on Sr${}_2$RuO${}_4$ sometimes doesn't see the superconducting gap
• Influence of Fermi Surface Geometry and Van Hove Singularities on the Optical Response of Sr${}_2$RuO${}_4$