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    Algebraic States in Continuum in d>1 Dimensional Non-Hermitian Systems

    Ao Yang1,2, Kai Zhang3, and Chen Fang1,4,*

    • *Contact author: cfang@iphy.ac.cn

    Phys. Rev. Lett. 136, 156603 – Published 17 April, 2026

    DOI: https://doi.org/10.1103/9dhm-k5kf

    Abstract

    We report the existence of algebraically localized eigenstates embedded within the continuum spectrum of 2D non-Hermitian systems with a single impurity. These modes, which we term algebraic states in continuum (AICs), decay algebraically as 1/|r| from the impurity site, and their energies lie within the bulk continuum spectrum under periodic boundary conditions. We analytically derive the threshold condition for the impurity strength required to generate such states. Remarkably, AICs are forbidden in Hermitian systems and in 1D non-Hermitian systems, making them unique to non-Hermitian systems in two and higher dimensions. To detect AICs, we introduce a local density of states as an experimental observable, which is readily accessible in photonic and acoustic platforms.

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