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arXiv · 2602.11155

Quasiperiodicity-induced non-Hermitian skin effect from the breakdown of scale-free localization

Kazuma Saito·Ryo Okugawa·Kazuki Yokomizo·Takami Tohyama·Chen-Hsuan Hsu
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Abstract

Non-reciprocal systems exhibit extreme sensitivity to boundary conditions, typically manifesting as the non-Hermitian skin effect (NHSE) under open boundaries. By bridging the boundaries with a tunable impurity bond, one can access intermediate regimes where scale-free localization (SFL) can emerge. Here, we investigate the competition between such boundary coupling and quasiperiodic disorder in a one-dimensional non-reciprocal lattice. Our analyses reveal a quasiperiodicity-induced breakdown of the SFL regime, which evolves into either the NHSE or an extended regime, depending on boundary conditions. These results uncover the crucial roles of boundary effects and quasiperiodicity in non-Hermitian systems.

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Kazuma Saito, Ryo Okugawa, Kazuki Yokomizo, Takami Tohyama, Chen-Hsuan Hsu. 2026-02-11. Quasiperiodicity-induced non-Hermitian skin effect from the breakdown of scale-free localization. https://arxiv.org/abs/2602.11155

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