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.

References in corpus (4)

• Formation of a Nematic Fluid at High Fields in Sr3Ru2O7
• Fermi surface and van Hove singularities in the itinerant metamagnet Sr3Ru2O7
• Field tunable spin density wave phases in Sr3Ru2O7
• Determining the Surface-To-Bulk Progression in the Normal-State Electronic Structure of Sr2RuO4 by Angle-Resolved Photoemission and Density Functional Theory

Cited by in corpus (1)

• Uniaxial stress effect on the electronic structure of quantum materials