Universal suppression of superfluid weight by disorder independent of quantum geometry and band dispersion

Alexander Lau, Sebastiano Peotta, Dmitry I. Pikulin, Enrico Rossi, Timo Hyart

Research output: Contribution to journalArticleScientific

5 Downloads (Pure)

Abstract

Motivated by the experimental progress in controlling the properties of the energy bands in superconductors, significant theoretical efforts have been devoted to study the effect of the quantum geometry and the flatness of the dispersion on the superfluid weight. In conventional superconductors, where the energy bands are wide and the Fermi energy is large, the contribution due to the quantum geometry is negligible, but in the opposite limit of flat-band superconductors the superfluid weight originates purely from the quantum geometry of Bloch wave functions. Here, we study how the energy band dispersion and the quantum geometry affect the disorder-induced suppression of the superfluid weight. Surprisingly, we find that the disorder-dependence of the superfluid weight is universal across a variety of models, and independent of the quantum geometry and the flatness of the dispersion. Our results suggest that a flat-band superconductor is as resilient to disorder as a conventional superconductor.
Original languageEnglish
JournalarXiv.org
Publication statusAccepted/In press - 1 Mar 2022
MoE publication typeB1 Article in a scientific magazine

Keywords

  • Condensed Matter - Superconductivity
  • Condensed Matter - Strongly Correlated Electrons

Fingerprint

Dive into the research topics of 'Universal suppression of superfluid weight by disorder independent of quantum geometry and band dispersion'. Together they form a unique fingerprint.

Cite this