On the engineering of higher-order Van Hove singularities in two dimensions

Anirudh Chandrasekaran (), Luke C. Rhodes, Edgar Abarca Morales, Carolina A. Marques, Phil D. C. King, Peter Wahl and Joseph J. Betouras ()
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Anirudh Chandrasekaran: Loughborough University
Luke C. Rhodes: University of St Andrews
Edgar Abarca Morales: University of St Andrews
Carolina A. Marques: University of St Andrews
Phil D. C. King: University of St Andrews
Peter Wahl: University of St Andrews
Joseph J. Betouras: Loughborough University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract The properties of correlated electron materials are often intricately linked to Van Hove singularities (VHS) in the vicinity of the Fermi energy. The class of these VHS is of great importance, with higher-order ones—with power-law divergence in the density of states—leaving frequently distinct signatures in physical properties. We use a new theoretical method to detect and analyse higher-order VHS (HOVHS) in two-dimensional materials and apply it to the electronic structure of the surface layer of Sr2RuO4. We then constrain a low energy model of the VHS of the surface layer of Sr2RuO4 against angle-resolved photoemission spectroscopy and quasiparticle interference data to analyse the VHS near the Fermi level. We show how these VHS can be engineered into HOVHS.

Date: 2024
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DOI: 10.1038/s41467-024-53650-2

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