Monolayer Kagome metals AV3Sb5

Sun-Woo Kim, Hanbit Oh, Eun-Gook Moon () and Youngkuk Kim ()
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Sun-Woo Kim: Sungkyunkwan University
Hanbit Oh: KAIST
Eun-Gook Moon: KAIST
Youngkuk Kim: Sungkyunkwan University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Recently, layered kagome metals AV3Sb5 (A = K, Rb, and Cs) have emerged as a fertile platform for exploring frustrated geometry, correlations, and topology. Here, using first-principles and mean-field calculations, we demonstrate that AV3Sb5 can crystallize in a mono-layered form, revealing a range of properties that render the system unique. Most importantly, the two-dimensional monolayer preserves intrinsically different symmetries from the three-dimensional layered bulk, enforced by stoichiometry. Consequently, the van Hove singularities, logarithmic divergences of the electronic density of states, are enriched, leading to a variety of competing instabilities such as doublets of charge density waves and s- and d-wave superconductivity. We show that the competition between orders can be fine-tuned in the monolayer via electron-filling of the van Hove singularities. Thus, our results suggest the monolayer kagome metal AV3Sb5 as a promising platform for designer quantum phases.

Date: 2023
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DOI: 10.1038/s41467-023-36341-2

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