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- W4312059726 abstract "Abstract The bulk-boundary correspondence is an integral feature of topological analysis and the existence of boundary or interface modes offers direct insight into the topological structure of the Bloch wave function. While only the topology of the wave function has been considered relevant to boundary modes, we demonstrate that another geometric quantity, the so-called quantum distance, can also host a bulk-interface correspondence. We consider a generic class of two-dimensional flat band systems, where the flat band has a parabolic band-crossing with another dispersive band. While such flat bands are known to be topologically trivial, we show that the nonzero maximum quantum distance between the eigenstates of the flat band around the touching point guarantees the existence of boundary modes at the interfaces between two domains with different chemical potentials or different maximum quantum distance. Moreover, the maximum quantum distance can predict even the explicit form of the dispersion relation and decay length of the interface modes." @default.
- W4312059726 created "2023-01-04" @default.
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- W4312059726 date "2022-12-10" @default.
- W4312059726 modified "2023-10-14" @default.
- W4312059726 title "Bulk-interface correspondence from quantum distance in flat band systems" @default.
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- W4312059726 doi "https://doi.org/10.1038/s42005-022-01102-y" @default.
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