We report the evolution of the electronic structure at the surface of the layered perovskite Sr2RuO4 under large in-plane uniaxial compression, leading to anisotropic B1g strains of εxx−εyy=−0.9±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 Sr2RuO4 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 Sr2RuO4 surface.
@article{arxiv.2303.00390,
title = {Hierarchy of Lifshitz transitions in the surface electronic structure of Sr$_2$RuO$_4$ under uniaxial compression},
author = {Edgar Abarca Morales and Gesa-R. Siemann and Andela Zivanovic and Philip A. E. Murgatroyd and Igor Markovic and Brendan Edwards and Chris A. Hooley and Dmitry A. Sokolov and Naoki Kikugawa and Cephise Cacho and Matthew D. Watson and Timur K. Kim and Clifford W. Hicks and Andrew P. Mackenzie and Phil D. C. King},
journal= {arXiv preprint arXiv:2303.00390},
year = {2023}
}