Antichiral states in twisted graphene multilayers

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2020
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Denner, M. Michael
Lado, Jose L.
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Physical Review Research ; 2 (2020), 4. - 043190. - American Physical Society. - eISSN 2643-1564
Abstract
The advent of topological phases of matter revealed a variety of observed boundary phenomena, such as chiral and helical modes found at the edges of two-dimensional (2D) topological insulators. Antichiral states in 2D semimetals, i.e., copropagating edge modes on opposite edges compensated by a counterpropagating bulk current, are also predicted, but, to date, no realization of such states in a solid-state system has been found. Here, we put forward a procedure to realize antichiral states in twisted van der Waals multilayers, by combining the electronic Dirac-cone spectra of each layer through the combination of the orbital moiré superstructure, an in-plane magnetic field, and interlayer bias voltage. In particular, we demonstrate that a twisted van der Waals heterostructure consisting of graphene/two layers of hexagonal boron nitride [(hBN)2]/graphene will show antichiral states at in-plane magnetic fields of 8 T, for a rotation angle of 0.2∘ between the graphene layers. Our findings engender a controllable procedure to engineer antichiral states in solid-state systems, as well as in quantum engineered metamaterials.
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ISO 690DENNER, M. Michael, Jose L. LADO, Oded ZILBERBERG, 2020. Antichiral states in twisted graphene multilayers. In: Physical Review Research. American Physical Society. 2(4), 043190. eISSN 2643-1564. Available under: doi: 10.1103/PhysRevResearch.2.043190
BibTex
@article{Denner2020Antic-55009,
  year={2020},
  doi={10.1103/PhysRevResearch.2.043190},
  title={Antichiral states in twisted graphene multilayers},
  number={4},
  volume={2},
  journal={Physical Review Research},
  author={Denner, M. Michael and Lado, Jose L. and Zilberberg, Oded},
  note={Article Number: 043190}
}
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