Robustness of flat band superconductivity against disorder in a two-dimensional Lieb lattice model

Abstract

Recently, the possibility of high-temperature superconductivity (SC) in flat-band (FB) systems has been the focus of a great deal of activity. This study reveals that unlike conventional intra-band SC for which disorder has a dramatic impact, that associated with FBs is surprisingly robust to disorder-induced fluctuations and quasi-particle localization. In particular, for weak off-diagonal disorder, the critical temperature decreases linearly with disorder amplitude for conventional SC, whereas it is only quadratic in the case of SC in FBs. Our findings could have a major impact on the research and development of new compounds whose high purity will no longer be a critical barrier to their synthesis.

published in Phys Rev B (Letter) (2025)

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Cited by in corpus (4)

• Altermagnetism and its induced higher-order topology on the Lieb lattice
• Quenched disorder and the BCS-BEC crossover in the Hubbard model
• Superfluid weight in disordered flat-band superconductors as a competition between localization functionals
• Gaplessness from disorder and quantum geometry in gapped superconductors