Spontaneous Valley Spirals in Magnetically Encapsulated Twisted Bilayer Graphene

Tobias Wolf, Oded Zilberberg, Gianni Blatter, Jose Lado

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

15 Sitaatiot (Scopus)
221 Lataukset (Pure)

Abstrakti

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.
AlkuperäiskieliEnglanti
Artikkeli056803
Sivut1-8
Sivumäärä8
JulkaisuPhysical Review Letters
Vuosikerta126
Numero5
DOI - pysyväislinkit
TilaJulkaistu - 4 helmik. 2021
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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