Hyperuniform charge distributions and phase transitions in a generalized Aubry-Andr\'e model

Lujia Xiang; Junmo Jeon; Shiro Sakai

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arXiv · 2606.17532

Hyperuniform charge distributions and phase transitions in a generalized Aubry-Andr\'e model

Lujia Xiang·Junmo Jeon·Shiro Sakai

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Abstract

We show the existence of distinct inhomogeneous charge distributions and a phase transition between them in aperiodic fermion systems. Using a generalized Aubry-Andr\'e model as an example, we obtain various types of charge distributions, which we classify by means of hyperuniformity, a general mean to quantify and classify the global uniformity of spatial distributions. Examining various cases of filling fraction and potential strength and shape, we find that the many-body charge distribution in this model is always hyperuniform, i.e., showing an anomalously suppressed long-range fluctuation, while its hyperuniformity class depends on the localization properties of the states around the Fermi energy, irrespective of those of high-energy states. Namely, the change in the localization properties of these single-particle states leaves a signature in the hyperuniformity class of many-body charge distribution. We further show a change of the hyperuniformity class corresponds to a phase transition between inhomogeneous many-body states, and that it is of the third order.

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Lujia Xiang, Junmo Jeon, Shiro Sakai. 2026-06-16. Hyperuniform charge distributions and phase transitions in a generalized Aubry-Andr\'e model. https://arxiv.org/abs/2606.17532

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