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Electrically Tunable Flat Bands and Magnetism in Twisted Bilayer Graphene

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2019

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

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https://doi.org/10.1103/PhysRevLett.123.096802
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http://arxiv.org/abs/1905.07651v4

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Physical Review Letters. American Physical Society (APS). 2019, 123(9), 096802. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.123.096802

Zusammenfassung

Twisted graphene bilayers provide a versatile platform to engineer metamaterials with novel emergent properties by exploiting the resulting geometric moiré superlattice. Such superlattices are known to host bulk valley currents at tiny angles (α≈0.3°) and flat bands at magic angles (α≈1°). We show that tuning the twist angle to α∗≈0.8° generates flat bands away from charge neutrality with a triangular superlattice periodicity. When doped with ±6 electrons per moiré cell, these bands are half-filled and electronic interactions produce a symmetry-broken ground state (Stoner instability) with spin-polarized regions that order ferromagnetically. Application of an interlayer electric field breaks inversion symmetry and introduces valley-dependent dispersion that quenches the magnetic order. With these results, we propose a solid-state platform that realizes electrically tunable strong correlations.

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ISO 690WOLF, Tobias M. R., Jose L. LADO, Gianni BLATTER, Oded ZILBERBERG, 2019. Electrically Tunable Flat Bands and Magnetism in Twisted Bilayer Graphene. In: Physical Review Letters. American Physical Society (APS). 2019, 123(9), 096802. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.123.096802
BibTex
@article{Wolf2019-08-30Elect-54987,
  year={2019},
  doi={10.1103/PhysRevLett.123.096802},
  title={Electrically Tunable Flat Bands and Magnetism in Twisted Bilayer Graphene},
  number={9},
  volume={123},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Wolf, Tobias M. R. and Lado, Jose L. and Blatter, Gianni and Zilberberg, Oded},
  note={Article Number: 096802}
}
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