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

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 mon...

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Bibliographic Details
Published in:Nature communications 2023-12, Vol.14 (1), p.7926-7926, Article 7926
Main Authors: Liu, Yu-Bo, Zhou, Jing, Wu, Congjun, Yang, Fan
Format: Article
Language:English
Subjects:
639/766/119/1003
639/766/119/2795
Angular momentum
Bilayers
Charge materials
Cuprates
Graphene
Humanities and Social Sciences
Interlayers
Metals
Monte Carlo simulation
multidisciplinary
Phase diagrams
Phases
Quasicrystals
Science
Science (multidisciplinary)
Superconductivity
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Summary: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 T c 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. Liu et al. theoretically study maximally-twisted homo-bilayers, such as 45 ∘ -twisted bilayer cuprates and 30 ∘ -twisted bilayer graphene. Through renormalization group and Monte-Carlo calculations, the authors reveal the presence of charge-4e superconductivity and chiral-metal phases in the phase diagram.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-023-43782-2