Discovery and construction of surface kagome electronic states induced by p-d electronic hybridization
arxiv(2023)
摘要
Kagome-lattice materials possess attractive properties for quantum computing
applications, but their synthesis remains challenging. Herein, we show surface
kagome electronic states (SKESs) on a Sn-terminated triangular Co3Sn2S2
surface, which are imprinted by vertical p-d electronic hybridization between
the surface Sn (subsurface S) atoms and the buried Co kagome lattice network in
the Co3Sn layer under the surface. Owing to the subsequent lateral
hybridization of the Sn and S atoms in a corner-sharing manner, the kagome
symmetry and topological electronic properties of the Co3Sn layer is proximate
to the Sn surface. The SKESs and both hybridizations were verified via qPlus
non-contact atomic force microscopy (nc-AFM) and density functional theory
calculations. The construction of SKESs with tunable properties can be achieved
by the atomic substitution of surface Sn (subsurface S) with other group III-V
elements (Se or Te), which was demonstrated theoretically. This work exhibits
the powerful capacity of nc-AFM in characterizing localized topological states
and reveals the strategy for synthesis of large-area transition-metal-based
kagome lattice materials using conventional surface deposition techniques.
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