Flat band based delocalized-to-localized transitions in a non-Hermitian diamond chain

Hui Liu, Zhanpeng Lu, Xu Xia, Zhihao Xu
Condensed Matter, Disordered Systems and Neural Networks, Disordered Systems and Neural Networks (cond-mat.dis-nn), Quantum Physics (quant-ph)
2023-11-05 16:00:00
In this paper, we investigate the influence of quasiperiodic perturbations on one-dimensional non-Hermitian diamond lattices that possess flat bands with an artificial magnetic flux $\theta$. Our study shows that the symmetry of these perturbations and the magnetic flux $\theta$ play a pivotal role in shaping the localization properties of the system. When $\theta=0$, the non-Hermitian lattice exhibits a single flat band in the crystalline case, and symmetric as well as antisymmetric perturbations can induce accurate mobility edges. In contrast, when $\theta=\pi$, the clean diamond lattice manifests three dispersionless bands referred to as an "all-band-flat" (ABF) structure, irrespective of the non-Hermitian parameter. The ABF structure restricts the transition from delocalized to localized states, as all states remain localized for any finite symmetric perturbation. Our numerical calculations further unveil that the ABF system subjected to antisymmetric perturbations exhibits multifractal-to-localized edges. Multifractal states are predominantly concentrated in the internal region of the spectrum. Additionally, we explore the case where $\theta$ lies within the range of $(0, \pi)$, revealing a diverse array of complex localization features within the system.
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