Journal
PHYSICAL REVIEW RESEARCH
Volume 3, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevResearch.3.L032003
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Funding
- European Research Council (ERC) [ERC-StG-Neupert-757867-PARATOP]
- Forschungskredit of the University of Zurich [FK-20-101]
- NCRR Marvel
- Swiss National Science Foundation [PP00P2_-176877]
- SNSF [PP00P2-176866]
- ONR [N00014-20-1-2352]
- Swiss National Science Foundation (SNF) [PP00P2_176877] Funding Source: Swiss National Science Foundation (SNF)
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This study proposes a method to impose a tailored potential onto a single graphene layer through local perturbations, resulting in flat energy bands. The research demonstrates the topological nature of these bands and the manifestation of nontrivial topology in corner-localized states.
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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