Superconductivity, correlated insulators, and Wess-Zumino-Witten terms in twisted bilayer graphene.
Wess–Zumino–Witten terms
strongly correlated systems
superconductivity
twisted bilayer graphene
Journal
Proceedings of the National Academy of Sciences of the United States of America
ISSN: 1091-6490
Titre abrégé: Proc Natl Acad Sci U S A
Pays: United States
ID NLM: 7505876
Informations de publication
Date de publication:
24 Nov 2020
24 Nov 2020
Historique:
pubmed:
11
11
2020
medline:
11
11
2020
entrez:
10
11
2020
Statut:
ppublish
Résumé
Recent experiments on twisted bilayer graphene have shown a high-temperature parent state with massless Dirac fermions and broken electronic flavor symmetry; superconductivity and correlated insulators emerge from this parent state at lower temperatures. We propose that the superconducting and correlated insulating orders are connected by Wess-Zumino-Witten terms, so that defects of one order contain quanta of another order and skyrmion fluctuations of the correlated insulator are a "mechanism" for superconductivity. We present a comprehensive listing of plausible low-temperature orders and the parent flavor symmetry-breaking orders. The previously characterized topological nature of the band structure of twisted bilayer graphene plays an important role in this analysis.
Identifiants
pubmed: 33168719
pii: 2014691117
doi: 10.1073/pnas.2014691117
pmc: PMC7703554
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
29543-29554Déclaration de conflit d'intérêts
The authors declare no competing interest.
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