Designing Kagome Lattice from Potassium Atoms on Phosphorus–Gold Surface Alloy

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Abstract
Materials with flat bands are considered as ideal platforms to explore strongly correlated physics such as the fractional quantum hall effect, high-temperature superconductivity, and more. In theory, a Kagome lattice with only nearest-neighbor hopping can give rise to a flat band. However, the successful fabrication of Kagome lattices is still very limited. Here, we provide a new design principle to construct the Kagome lattice by trapping atoms into Kagome arrays of potential valleys, which can be realized on a potassium-decorated phosphorus–gold surface alloy. Theoretical calculations show that the flat band is less correlated with the neighboring trivial electronic bands, which can be further isolated and dominate around the Fermi energy with increased Kagome lattice parameters of potassium atoms. Our results provide a new strategy for constructing Kagome lattices, which serve as an ideal platform to study topological and more general flat band phenomena.
Funding Information
  • Ministry of Education - Singapore (MOE2019-T2-1-002, R143-000-A43-114)
  • Natural Science Foundation of Jiangsu Province (BK20170005)
  • Australian Research Council (FT160100207)
  • Queensland University of Technology
  • National Natural Science Foundation of China (21825302, 21872100, 21903076)
  • Natural Science Foundation of Anhui Province (1908085QB81)
  • Taishan Scholar Program of Shandong Province of China (tsqn201909122)

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