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- W4220959217 abstract "Bulk-boundary correspondence is a fundamental principle for topological phases where bulk topology determines gapless boundary states. On the other hand, it has been known that corner or hinge modes in higher-order topological insulators may appear due to ``extrinsic'' topology of the boundaries even when the bulk topological numbers are trivial. In this paper, we find that Floquet anomalous boundary states in quantum walks have similar extrinsic topological natures. In contrast to higher-order topological insulators, the extrinsic topology in quantum walks is manifest even for first-order topological phases. We present the topological table for extrinsic topology in quantum walks and illustrate extrinsic natures of Floquet anomalous boundary states in concrete examples." @default.
- W4220959217 created "2022-04-03" @default.
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- W4220959217 date "2022-03-14" @default.
- W4220959217 modified "2023-10-18" @default.
- W4220959217 title "Extrinsic topology of Floquet anomalous boundary states in quantum walks" @default.
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- W4220959217 doi "https://doi.org/10.1103/physrevb.105.094306" @default.
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