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Van Hove tuning of Fermi surface instabilities through compensated metallicity

Hendrik Hohmann1,2, Matteo Dürrnagel1,2,3, Matthew Bunney4,5, Stefan Enzner1,2, Tilman Schwemmer1, Titus Neupert6, Giorgio Sangiovanni1,2, Stephan Rachel2,4, and Ronny Thomale1,2,*

  • *Contact author: rthomale@physik.uni-wuerzburg.de

Phys. Rev. B 111, L121105 – Published 18 March, 2025

DOI: https://doi.org/10.1103/PhysRevB.111.L121105

Abstract

Van-Hove (vH) singularities in the vicinity of the Fermi level facilitate the emergence of electronically mediated Fermi surface instabilities. This is because they provide a momentum-localized enhancement of density of states promoting selective electronic scattering channels. High-temperature topological superconductivity has been argued for in graphene at vH filling which, however, has so far proven inaccessible due to the demanded large doping from pristine half filling. We propose compensated metallicity as a path to unlock vH-driven pairing close to half filling in an electronic honeycomb lattice model. Enabled by an emergent multipocket fermiology, charge compensation is realized by strong breaking of chiral symmetry from intrasublattice hybridization, while retaining vH dominated physics at the Fermi level. We conclude by proposing tangible realizations through quantum material design.

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