Designing Kagome Lattice from Potassium Atoms on Phosphorus–Gold
Surface Alloy
Posted on 2020-06-25 - 19:46
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.
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Sun, Shuo; Zhao, Songtao; Luo, Yong Zheng; Gu, Xingyu; Lian, Xu; Tadich, Anton; et al. (2020). Designing Kagome Lattice from Potassium Atoms on Phosphorus–Gold
Surface Alloy. ACS Publications. Collection. https://doi.org/10.1021/acs.nanolett.0c02426