Emergence of multifractality through cascade-like transitions in a
mosaic interpolating Aubry-Andr\'{e}-Fibonacci chain
- URL: http://arxiv.org/abs/2310.16663v1
- Date: Wed, 25 Oct 2023 14:24:08 GMT
- Title: Emergence of multifractality through cascade-like transitions in a
mosaic interpolating Aubry-Andr\'{e}-Fibonacci chain
- Authors: Qi Dai, Zhanpeng Lu, and Zhihao Xu
- Abstract summary: We show that the mosaic AA limit for the states in the band-edge regions evolves into multifractal ones through a cascade of delocalization transitions.
This cascade shows lobes of lower fractal dimension values separated by maxima of fractal dimension.
In contrast, the states in the band-center region display an anomalous cascading process, where it emerges lobes of higher fractal dimension values are separated by the regions with lower fractal dimensions.
- Score: 12.692889017894757
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: In this paper, we explore the localization features of wave functions in a
family of mosaic quasiperiodic chains obtained by continuously interpolating
between two limits: the mosaic Aubry-Andr\'{e} (AA) model, known for its exact
mobility edges with extended states in the band-center region, and localized
ones in the band-edge regions for a large enough modulation amplitude, and the
mosaic Fibonacci chain, which exhibits its multifractal nature for all the
states except for the extended one with $E=0$ for an arbitrary finite
modulation amplitude. We discover that the mosaic AA limit for the states in
the band-edge regions evolves into multifractal ones through a cascade of
delocalization transitions. This cascade shows lobes of lower fractal dimension
values separated by maxima of fractal dimension. In contrast, the states in the
band-center region (except for the $E=0$ state) display an anomalous cascading
process, where it emerges lobes of higher fractal dimension values are
separated by the regions with lower fractal dimensions. Our findings offer
insight into understanding the multifractality of quasiperiodic chains.
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