Spontaneous Valley Spirals in Magnetically Encapsulated Twisted Bilayer Graphene

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorWolf, Tobiasen_US
dc.contributor.authorZilberberg, Odeden_US
dc.contributor.authorBlatter, Giannien_US
dc.contributor.authorLado, Joseen_US
dc.contributor.departmentDepartment of Applied Physicsen
dc.contributor.groupauthorCorrelated Quantum Materials (CQM)en
dc.contributor.organizationETH Zurichen_US
dc.date.accessioned2021-02-09T09:06:53Z
dc.date.available2021-02-09T09:06:53Z
dc.date.issued2021-02-04en_US
dc.description.abstractVan der Waals heterostructures provide a rich platform for emergent physics due to their tunable hybridization of layers, orbitals, and spin. Here, we find that twisted bilayer graphene stacked between antialigned ferromagnetic insulators can feature flat electronic bands due to the interplay between twist, exchange proximity, and spin–orbit coupling. These flat bands are nearly degenerate in valley only and are effectively described by a triangular superlattice model. At half filling, we find that interactions induce spontaneous valley correlations that favor spiral order and derive a low-energy valley-Heisenberg model with symmetric and antisymmetric exchange couplings. We also show how electric interlayer bias broadens the bands and tunes these couplings. Our results put forward magnetic van der Waals heterostructures as a platform to explore valley-correlated states.en
dc.description.versionPeer revieweden
dc.format.extent8
dc.format.extent1-8
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationWolf, T, Zilberberg, O, Blatter, G & Lado, J 2021, ' Spontaneous Valley Spirals in Magnetically Encapsulated Twisted Bilayer Graphene ', Physical Review Letters, vol. 126, no. 5, 056803, pp. 1-8 . https://doi.org/10.1103/PhysRevLett.126.056803en
dc.identifier.doi10.1103/PhysRevLett.126.056803en_US
dc.identifier.issn0031-9007
dc.identifier.issn1079-7114
dc.identifier.otherPURE UUID: a3ede710-6aac-4bef-8c36-6f975334c9b6en_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/a3ede710-6aac-4bef-8c36-6f975334c9b6en_US
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dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/55853872/Wolf_Spontaneous.PhysRevLett.126.056803.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/102658
dc.identifier.urnURN:NBN:fi:aalto-202102091958
dc.language.isoenen
dc.publisherAmerican Physical Society
dc.relation.ispartofseriesPhysical Review Lettersen
dc.relation.ispartofseriesVolume 126, issue 5en
dc.rightsopenAccessen
dc.titleSpontaneous Valley Spirals in Magnetically Encapsulated Twisted Bilayer Grapheneen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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