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Vestigial singlet pairing in a fluctuating magnetic triplet superconductor and its implications for graphene superlattices

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  • Prathyush P. Poduval

    (University of California
    University of Maryland)

  • Mathias S. Scheurer

    (University of Stuttgart
    University of Innsbruck)

Abstract

Stacking and twisting graphene layers allows to create and control a two-dimensional electron liquid with strong correlations. Experiments indicate that these systems exhibit strong tendencies towards both magnetism and triplet superconductivity. Motivated by this phenomenology, we study a 2D model of fluctuating triplet pairing and spin magnetism. Individually, their respective order parameters, d and N, cannot order at finite temperature. Nonetheless, the model exhibits a variety of vestigial phases, including charge-4e superconductivity and broken time-reversal symmetry. Our main focus is on a phase characterized by finite d ⋅ N, which has the same symmetries as the BCS state, a Meissner effect, and metastable supercurrents, yet rather different spectral properties: most notably, the suppression of the electronic density of states at the Fermi level can resemble that of either a fully gapped or nodal superconductor, depending on parameters. This provides a possible explanation for recent tunneling experiments in the superconducting phase of graphene moiré systems.

Suggested Citation

  • Prathyush P. Poduval & Mathias S. Scheurer, 2024. "Vestigial singlet pairing in a fluctuating magnetic triplet superconductor and its implications for graphene superlattices," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45950-4
    DOI: 10.1038/s41467-024-45950-4
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