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

G. Bouzerar; M. Thumin

doi:10.1103/PhysRevB.111.L020506

← Back to search

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

G. Bouzerar, M. Thumin

DOI 10.1103/PhysRevB.111.L020506 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

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 Letter reveals that unlike conventional intraband SC for which disorder has a dramatic impact, that associated with FBs is surprisingly robust to disorder-induced fluctuations and quasiparticle 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.