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Spontaneous Valley Spirals in Magnetically Encapsulated Twisted Bilayer Graphene

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2021

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Wolf, Tobias M. R.
Blatter, Gianni
Lado, Jose L.

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Physical Review Letters. American Physical Society (APS). 2021, 126(5), 056803. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.126.056803

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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.

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ISO 690WOLF, Tobias M. R., Oded ZILBERBERG, Gianni BLATTER, Jose L. LADO, 2021. Spontaneous Valley Spirals in Magnetically Encapsulated Twisted Bilayer Graphene. In: Physical Review Letters. American Physical Society (APS). 2021, 126(5), 056803. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.126.056803
BibTex
@article{Wolf2021-02-05Spont-54904,
  year={2021},
  doi={10.1103/PhysRevLett.126.056803},
  title={Spontaneous Valley Spirals in Magnetically Encapsulated Twisted Bilayer Graphene},
  number={5},
  volume={126},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Wolf, Tobias M. R. and Zilberberg, Oded and Blatter, Gianni and Lado, Jose L.},
  note={Article Number: 056803}
}
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