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- W3154457798 abstract "Effective mass in the Dirac equation model is generally applied to condensed-matter systems for describing the state of electrons and determining the topological character. In these systems, the sign change of the effective mass is accompanied by a topological transition. Here we demonstrate that the band-gap topological property of a photonic crystal can also be related to a pseudo effective mass that is constructed by mapping Maxwell’s equations to a Dirac-like equation. Then, we propose an efficient method to achieve a sign change of the pseudo effective mass by surface modification, resulting in a topological transition of the photonic crystal. Such a topological transition is confirmed by the emergence of a zero-dimensional topological bound state. We experimentally verify the theoretical predictions via colloidal photonic crystals, where a thin surface coating can lead to the topological transition. Our research provides a new avenue for the manipulation of topological properties of optical systems." @default.
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- W3154457798 date "2021-04-21" @default.
- W3154457798 modified "2023-10-17" @default.
- W3154457798 title "Topological Transition Enabled by Surface Modification of Photonic Crystals" @default.
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- W3154457798 doi "https://doi.org/10.1021/acsphotonics.1c00017" @default.
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