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I05-ARPES	Hierarchy of Lifshitz transitions in the surface electronic structure of Sr2RuO4 under uniaxial compression Edgar Abarca Morales , Gesa-R. Siemann , Andela Zivanovic , Philip A. E. Murgatroyd , Igor Markovic , Brendan Edwards , Chris A. Hooley , Dmitry A. Sokolov , Naoki Kikugawa , Cephise Cacho , Matthew D. Watson , Timur K. Kim , Clifford W. Hicks , Andrew P. Mackenzie , Phil D. C. King Physical Review Letters 130 DOI: 10.1103/PhysRevLett.130.096401 Diamond Proposal Number(s): [27471, 28412] Show Abstract ▼ 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 1 g strains of ϵ x x − ϵ y y = − 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 Sr 2 RuO 4 hosts. From comparison to tight-binding modeling, 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 state singularities to the Fermi level, in turn paving the way to the possible realization of rich collective states at the Sr 2 RuO 4 surface.	Feb 2023

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