Spontaneous Valley Spirals in Magnetically Encapsulated Twisted Bilayer Graphene

Tobias Wolf, Oded Zilberberg, Gianni Blatter, Jose Lado

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Van 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.
Original languageEnglish
Article number056803
Pages (from-to)1-8
Number of pages8
JournalPhysical Review Letters
Volume126
Issue number5
DOIs
Publication statusPublished - 2021
MoE publication typeA1 Journal article-refereed

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