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Moiré-pattern-based potential engineering has become an important way to explore exotic physics in a variety of two-dimensional condensed matter systems. While these potentials have induced correlated phenomena in almost all commonly studied 2D materials, monolayer graphene has remained an exception. We demonstrate theoretically that a single layer of graphene, when placed between two bulk boron nitride crystal substrates with the appropriate twist angles, can support a robust topological ultraflat band emerging as the second hole band. This is one of the simplest platforms to design and exploit topological flat bands.Received 3 July 2023Revised 6 December 2023Accepted 13 February 2024DOI:https://doi.org/10.1103/PhysRevLett.132.126401© 2024 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasFlat bandsTopological materialsTwistronicsPhysical SystemsGrapheneSuperlatticesCondensed Matter, Materials & Applied Physics
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