Using Disorder to Identify Bogoliubov Fermi-Surface States

Journal Article · Fri Dec 17 00:00:00 UTC 2021 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.127.257002 · OSTI ID:1980241

Oh, Hanbit ^[1]; Agterberg, Daniel F.  ^[2]; Moon, Eun-Gook ^[3]

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1. Korea Advanced Inst. Science and Technology (KAIST), Daejeon (South Korea); OSTI
2. Univ. of Wisconsin, Milwaukee, WI (United States)
3. Korea Advanced Inst. Science and Technology (KAIST), Daejeon (South Korea)

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 Sr₂RuO₄, FeSe_1-xS_x, and UBe₁₃.

• Research Organization: Univ. of Wisconsin, Madison, WI (United States)
• Sponsoring Organization: National Research Foundation of Korea (NRF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
• Grant/Contract Number: SC0021971
• OSTI ID: 1980241
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 25 Vol. 127; ISSN 0031-9007
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English