Nonequilibrium topological response under charge dephasing
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866915821283966976 |
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| author | Lu, Shuangyuan Silveira, Lucas Q You, Yizhi |
| author_facet | Lu, Shuangyuan Silveira, Lucas Q You, Yizhi |
| contents | We explore nonequilibrium topological responses of symmetry-protected topological (SPT) states in open quantum systems subject to decoherence. For SPT wavefunctions protected by a product symmetry G $\times$ S , where G defects are decorated with S charge, we show that local dephasing of the S charge density generically induces spontaneous strong-to-weak symmetry breaking (SWSSB) of G in the resulting mixed-state ensemble. We extend this mechanism to SPT phases protected by higher-form and spatially modulated symmetries, and further to gapless SPT states, demonstrating that dephasing-induced SWSSB persists well beyond conventional gapped 0-form settings. Our results provide a qualitative, channel-defined fingerprint of SPT order that is intrinsic to open-system dynamics and goes beyond equilibrium linear response. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_23484 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Nonequilibrium topological response under charge dephasing Lu, Shuangyuan Silveira, Lucas Q You, Yizhi Strongly Correlated Electrons We explore nonequilibrium topological responses of symmetry-protected topological (SPT) states in open quantum systems subject to decoherence. For SPT wavefunctions protected by a product symmetry G $\times$ S , where G defects are decorated with S charge, we show that local dephasing of the S charge density generically induces spontaneous strong-to-weak symmetry breaking (SWSSB) of G in the resulting mixed-state ensemble. We extend this mechanism to SPT phases protected by higher-form and spatially modulated symmetries, and further to gapless SPT states, demonstrating that dephasing-induced SWSSB persists well beyond conventional gapped 0-form settings. Our results provide a qualitative, channel-defined fingerprint of SPT order that is intrinsic to open-system dynamics and goes beyond equilibrium linear response. |
| title | Nonequilibrium topological response under charge dephasing |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2602.23484 |