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- W4366999211 abstract "Topological phases have been reported on self-similar structures in the presence of a perpendicular magnetic field. Here, we present an understanding of these phases from a perspective of spectral flow and charge pumping. We study the Harper-Hofstadter model on self-similar structures constructed from the Sierpinski gasket. We numerically investigate the spectral flow and the associated charge pumping when a flux tube is inserted through the structure and the flux through the tube is varied adiabatically. We find that the nature of the spectral flow is qualitatively different from that of translationally invariant non-interacting systems with a perpendicular magnetic field. We show that the instantaneous eigenspectra can be used to understand the quantization of the charge pumped over a cycle, and hence to understand the topological character of the system. We show the correspondence between the local contributions to the Hall conductivity and the spectral flow of the edge-like states. We also show that the edge-like states can be approximated by eigenstates of the discrete angular-momentum operator, their chiral nature being a consequence of this." @default.
- W4366999211 created "2023-04-27" @default.
- W4366999211 creator A5018448317 @default.
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- W4366999211 date "2023-04-21" @default.
- W4366999211 modified "2023-09-26" @default.
- W4366999211 title "Adiabatic pumping and transport in the Sierpinski-Hofstadter model" @default.
- W4366999211 doi "https://doi.org/10.1103/physrevresearch.5.033132" @default.
- W4366999211 hasPublicationYear "2023" @default.
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