Gauge Field Induced Unconventional Skin Effect in Spinful Non-Hermitian Systems
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866909805548929024 |
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| author | Sanahal, Moirangthem Panda, Subhasis Nandy, Snehasish |
| author_facet | Sanahal, Moirangthem Panda, Subhasis Nandy, Snehasish |
| contents | The non-Hermitian skin effect (NHSE), a hallmark of non-Hermitian systems, stems from the topological nature of complex energy spectra, typically characterized by a non-zero spectral winding number. Beyond the spinless frameworks considered so far, here we realize a generic, tunable spinful NHSE in a 1D tight-binding lattice endowed with spin-dependent Abelian gauge fields. With proper tuning of the gauge parameter, we uncover an emergence of bidirected, spin-polarized zero-winding skin states, appearing in the absence of transpose-type time-reversal symmetry (T RS†) and featuring scale-restricted localization with non-Bloch spectral stability. While clearly distinct from the known Z2 and Critical NHSEs, these unconventional skin states evolve into them upon enforcing TRS† and introducing inter-spin coupling via magnetic fields, respectively. The magnetic field further drives a transition from a bidirectional to a unidirectional skin configuration. Our work unifies the previously known zero-winding NHSEs within a broader framework and provides experimentally accessible routes for realization in photonic and ultracold atomic systems with synthetic gauge fields. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_05458 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Gauge Field Induced Unconventional Skin Effect in Spinful Non-Hermitian Systems Sanahal, Moirangthem Panda, Subhasis Nandy, Snehasish Mesoscale and Nanoscale Physics The non-Hermitian skin effect (NHSE), a hallmark of non-Hermitian systems, stems from the topological nature of complex energy spectra, typically characterized by a non-zero spectral winding number. Beyond the spinless frameworks considered so far, here we realize a generic, tunable spinful NHSE in a 1D tight-binding lattice endowed with spin-dependent Abelian gauge fields. With proper tuning of the gauge parameter, we uncover an emergence of bidirected, spin-polarized zero-winding skin states, appearing in the absence of transpose-type time-reversal symmetry (T RS†) and featuring scale-restricted localization with non-Bloch spectral stability. While clearly distinct from the known Z2 and Critical NHSEs, these unconventional skin states evolve into them upon enforcing TRS† and introducing inter-spin coupling via magnetic fields, respectively. The magnetic field further drives a transition from a bidirectional to a unidirectional skin configuration. Our work unifies the previously known zero-winding NHSEs within a broader framework and provides experimentally accessible routes for realization in photonic and ultracold atomic systems with synthetic gauge fields. |
| title | Gauge Field Induced Unconventional Skin Effect in Spinful Non-Hermitian Systems |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2505.05458 |