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- W3216414212 abstract "Superlattice potentials are theoretically predicted to modify the single-particle electronic structures. The resulting Coulomb-interaction-dominated low-energy physics would generate highly novel many-body phenomena. Here, by in situ tunneling spectroscopy, we show the signatures of superstructure-modulated correlated electron states in epitaxial bilayer graphene (BLG) on 6H-SiC(0001). As the carrier density is locally quasi-'tuned' by the superlattice potentials of a 6x6 interface reconstruction phase, the spectral-weight transfer occurs between the two broad peaks flanking the charge-neutral point. Such detected non-rigid band shift beyond the single-particle band description implies the existence of correlation effects, probably attributed to the modified interlayer coupling in epitaxial BLG by the 6x6 reconstruction as in magic-angle BLG by the Moire potentials. Quantitative analysis suggests the intrinsic interface reconstruction shows a high carrier tunability of around 1/2 filling range, equivalent to the back gating by a voltage of around 70 V in a typical gated BLG/SiO2/Si device. The finding in interface-modulated epitaxial BLG with reconstruction phase extends the BLG platform with electron correlations beyond the magic-angle situation, and may stimulate further investigations on correlated states in graphene systems and other van der Waals materials." @default.
- W3216414212 created "2021-12-06" @default.
- W3216414212 creator A5032764121 @default.
- W3216414212 creator A5090769394 @default.
- W3216414212 date "2021-12-01" @default.
- W3216414212 modified "2023-09-23" @default.
- W3216414212 title "Spectroscopic evidence for electron correlations in the interface-modulated epitaxial bilayer graphene" @default.
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- W3216414212 hasPublicationYear "2021" @default.
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