Topological Flat Bands in 2D Breathing‐Kagome Lattice Nb3TeCl7
Flat bands (FBs) can appear in two‐dimensional (2D) geometrically frustrated systems caused by quantum destructive interference (QDI). However, the scarcity of pure 2D frustrated crystal structures in natural materials makes FBs hard to be identified, let alone modulate FBs relating to electronic pr...
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Veröffentlicht in: | Advanced materials (Weinheim) 2023-10, Vol.35 (41), p.n/a |
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Sprache: | eng |
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Zusammenfassung: | Flat bands (FBs) can appear in two‐dimensional (2D) geometrically frustrated systems caused by quantum destructive interference (QDI). However, the scarcity of pure 2D frustrated crystal structures in natural materials makes FBs hard to be identified, let alone modulate FBs relating to electronic properties. Here, the experimental evidence of the complete electronic QDI induced FB contributed by the 2D breathing‐kagome layers of Nb atoms in Nb3TeCl7 (NTC) is reported. An identical chemical state and 2D localization characteristics of the Nb breathing‐kagome layers are experimentally confirmed, based on which NTC is demonstrated to be a superior concrete candidate for the breathing‐kagome tight‐binding model. Furthermore, it theoretically establishes the tunable roles of the on‐site energy over Nb sites on bandwidth, energy position, and topology of FBs in NTC. This work opens an aveanue to manipulate FB characteristics in these 4d transition‐metal‐based breathing‐kagome materials.
The experimental evidence of the nearly independent single topological flat band (FB) generated by the 2D Nb breathing‐kagome layer in Nb3TeCl7 with identical on‐site energy of Nb sites is reported. The possibility of modulating the bandwidth, energy position, and topology of the FB by altering the on‐site energy over Nb sites in the 2D breathing‐kagome frustrated geometry is disclosed. |
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ISSN: | 0935-9648 1521-4095 |
DOI: | 10.1002/adma.202301790 |