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- W4315707515 abstract "Two-dimensional higher-order topological insulators can display a number of exotic phenomena, such as half-integer charges localized at both corners and disclination defects. In this paper, we analyze these phenomena, focusing on the paradigmatic example of the quadrupole insulator with ${C}_{4}$ rotation symmetry, and present a topological field theory description of the mixed geometry-charge responses. Our theory provides a unified description of the corner and disclination charges in terms of a physical geometry (which encodes disclinations), and an effective geometry (which encodes corners). We extend this analysis to interacting systems, and predict the response of fractional quadrupole insulators, which exhibit charge $e/2(2k+1)$ bound to corners and disclinations." @default.
- W4315707515 created "2023-01-12" @default.
- W4315707515 creator A5046529785 @default.
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- W4315707515 date "2022-12-28" @default.
- W4315707515 modified "2023-09-24" @default.
- W4315707515 title "Crystalline responses for rotation-invariant higher-order topological insulators" @default.
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- W4315707515 doi "https://doi.org/10.1103/physrevb.106.l241113" @default.
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