Impurity-induced topological decomposition

• URL: http://arxiv.org/abs/2510.21928v1
• Date: Fri, 24 Oct 2025 18:00:18 GMT
• Title: Impurity-induced topological decomposition
• Authors: Tianxing Shi, Chuhang Zhang, Liang Jin, Linhu Li,
• Abstract summary: Controlling topological phases is a central goal in quantum materials and related fields.<n>We uncover a mechanism in which local on-site impurities act as knobs to decompose global topological properties in discrete steps.
• Score: 3.333459889259787
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Controlling topological phases is a central goal in quantum materials and related fields, enabling applications such as robust transport and programmable edge states. Here we uncover a mechanism in which local on-site impurities act as knobs to decompose global topological properties in discrete steps. In non-Hermitian lattices with spectral winding topology, we show that each impurity sequentially reduces the winding number by one, which is directly manifested as a stepwise decomposition of quantized plateaus in the steady-state response. Based on this principle, we further develop a scheme that sequentially induces topological edge states under impurity control, in a class of Hermitian topological systems constructed by doubling the non-Hermitian ones. Our findings reveal a general scheme to tune global topological properties with local perturbations, establishing a universal framework for impurity-controlled topological phases and offering a foundation for future exploration of reconfigurable topological phenomena across diverse physical platforms.

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