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  • Letter
  • Open Access

Flat bands with fragile topology through superlattice engineering on single-layer graphene

Anastasiia Skurativska, Stepan S. Tsirkin, Fabian D. Natterer, Titus Neupert, and Mark H. Fischer

  • Department of Physics, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland

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Phys. Rev. Research 3, L032003 – Published 2 July, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.L032003

Abstract

Magic-angle twisted bilayer graphene has received a lot of interest due to its flat bands with potentially nontrivial topology that lead to intricate correlated phases. A spectrum with flat bands, however, does not require a twist between multiple sheets of two-dimensional materials, but can be realized with an appropriate periodic potential. Here, we propose the imposition of a tailored potential onto a single graphene layer through local perturbations that could be created via lithography or adatom manipulation, which also results in an energy spectrum featuring flat bands. First-principle calculations for an appropriate adatom decoration of graphene indeed show the presence of flat bands and a symmetry-indicator analysis further reveals the bands' topological nature. This nontrivial topology manifests itself in corner-localized states with a filling anomaly as we show using a tight-binding calculation. Our proposal of a single decorated graphene sheet provides a new versatile route to study correlated phases in topologically nontrivial, flat band structures.

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Phys. Rev. Research 3, L032003– Published 2 July, 2021
  • Received 22 February 2021
  • Accepted 7 June 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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