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Charge-4e superconductivity and chiral metal in 45°-twisted bilayer cuprates and related bilayers

Author

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  • Yu-Bo Liu

    (Beijing Institute of Technology)

  • Jing Zhou

    (Chongqing University of Posts and Telecommunications
    Chongqing University of Posts and Telecommunications)

  • Congjun Wu

    (WestLake University
    Westlake University
    Westlake University
    Westlake Institute for Advanced Study)

  • Fan Yang

    (Beijing Institute of Technology)

Abstract

The material realization of charge-4e/6e superconductivity (SC) is a big challenge. Here, we propose to realize charge-4e SC in maximally-twisted homobilayers, such as 45∘-twisted bilayer cuprates and 30∘-twisted bilayer graphene, referred to as twist-bilayer quasicrystals (TB-QC). When each monolayer hosts a pairing state with the largest pairing angular momentum, previous studies have found that the second-order interlayer Josephson coupling would drive chiral topological SC (TSC) in the TB-QC. Here we propose that, above the Tc of the chiral TSC, either charge-4e SC or chiral metal can arise as vestigial phases, depending on the ordering of the total- and relative-pairing-phase fields of the two layers. Based on a thorough symmetry analysis to get the low-energy effective Hamiltonian, we conduct a combined renormalization-group and Monte-Carlo study and obtain the phase diagram, which includes the charge-4e SC and chiral metal phases.

Suggested Citation

  • Yu-Bo Liu & Jing Zhou & Congjun Wu & Fan Yang, 2023. "Charge-4e superconductivity and chiral metal in 45°-twisted bilayer cuprates and related bilayers," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43782-2
    DOI: 10.1038/s41467-023-43782-2
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