Using Disorder to Identify Bogoliubov Fermi-Surface States

Abstract

We argue that a superconducting state with a Fermi-surface of Bogoliubov quasiparticles, a Bogoliubov Fermi-surface (BG-FS), can be identified by the dependence of physical quantities on disorder. In particular, we show that a linear dependence of the residual density of states at weak disorder distinguishes a BG-FS state from other nodal superconducting states. We further demonstrate the stability of supercurrent against impurities and a characteristic Drude-like behavior of the optical conductivity. Our results can be directly applied to electron irradiation experiments on candidate materials of BG-FSs, including Sr${}_2$RuO${}_4$, FeSe${}_{1-x}$S${}_x$, and UBe${}_{13}$.

Published at Physical Review Letters (Phys. Rev. Lett. 127, 257002 (2021)). Main text: 6 pages, 2 figures, 1 table, Supplemental material: 15 pages, 7 figures, 2 tables

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