Observation of kagome-like bands in two-dimensional semiconducting Cr<sub>8</sub>Se<sub>12</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 39414826.
- Also identified by DOI 10.1038/s41467-024-53314-1 and PMC identifier 11484974.
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Abstract
The kagome lattice is a versatile platform for investigating correlated electronic states. However, its realization in two-dimensional (2D) semiconductors for tunable device applications is still challenging. An alternative strategy to create kagome-like bands is to realize a coloring-triangle (CT) lattice in semiconductors through a distortion of a modified triangular lattice. Here, we report the observation of low-energy kagome-like bands in a semiconducting 2D transition metal chalcogenide-Cr<sub>8</sub>Se<sub>12</sub> with a thickness of 7 atomic layers-which exhibits a CT lattice and a bandgap of 0.8 eV. The Cr-deficient layer beneath the topmost Se-full layer is partially occupied with 2/3 occupancy, yielding a √3 × √3 Cr honeycomb network. Angle-resolved photoemission spectroscopy measurements and first-principles investigations reveal the surface kagome-like bands near the valence band maximum, which are attributed to topmost Se p<sub>z</sub> orbitals modulated by the honeycomb Cr.