Fractal topological band-gap structure induced by singularities in the one-dimensional Thue–Morse system

The physical origin of the fractal topological band-gap structure in the one-dimensional Thue–Morse system has been revealed, which is characterized by the evolutions of two types of topological singularities with zero-scattering properties and the paths of phase vortex points, which are the mirrore...

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Bibliographic Details
Published in:Photonics research (Washington, DC) DC), 2021-04, Vol.9 (4), p.622
Main Authors: Zhang, Yu, Xiong, Langlang, Zhang, Meng, Jiang, Xunya
Format: Article
Language:English
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Summary:The physical origin of the fractal topological band-gap structure in the one-dimensional Thue–Morse system has been revealed, which is characterized by the evolutions of two types of topological singularities with zero-scattering properties and the paths of phase vortex points, which are the mirrored paths of the first-type singularities. The field distribution of the upper and lower gap-edge states will interchange when the traditional gaps are closed and reopened. The topologically protected edge-states are found at both traditional gaps and fractal gaps. Our work broadens the topological properties of quasicrystals or aperiodic systems and provides potential applications in new optoelectronic devices.
ISSN:2327-9125
2327-9125
DOI:10.1364/PRJ.405230