Spin-Locked Helical Currents and Pure Spin Pumping in Altermagnetic Nanotubes
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| Format: | Preprint |
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2025
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| _version_ | 1866912673496563712 |
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| author | Chen, Xin Han, Zhen Li, Linyang Zhao, Mingwen |
| author_facet | Chen, Xin Han, Zhen Li, Linyang Zhao, Mingwen |
| contents | Altermagnetism has been widely explored in 3D and 2D crystals, but its one-dimensional realization remains largely unexplored. Here we propose an altermagnetic nanotube formed by rolling a 2D altermagnet, which converts momentum-odd spin polarization into spin-chirality locking enforced by the screw axis. Unlike curvature-induced magnetization in bent films, the nanotube is mirror-antisymmetric and produce no net magnetization. Two reciprocal effects emerge: (i) a single-spin injection drives a helical current whose handedness is fixed by the spin, yielding opposite-sign axial magnetic fields; and (ii) a time-varying axial flux generates a circumferential Faraday field that drives equal-magnitude but opposite axial charge currents in the two spin channels, producing a pure spin current under open-circuit conditions. As an implication, spin accumulation programs the tube's handedness and can imprint it onto otherwise achiral coaxial nanotubes in one-dimensional van der Waals assemblies. First-principles results for V2Se2O confirm spin-dependent helical wave functions near both band edges, establishing a nonrelativistic route to spin-programmable chiral nanodevices and compact flux generators/charge-neutral spin injectors without static magnetic bias. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_19700 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spin-Locked Helical Currents and Pure Spin Pumping in Altermagnetic Nanotubes Chen, Xin Han, Zhen Li, Linyang Zhao, Mingwen Mesoscale and Nanoscale Physics Materials Science Altermagnetism has been widely explored in 3D and 2D crystals, but its one-dimensional realization remains largely unexplored. Here we propose an altermagnetic nanotube formed by rolling a 2D altermagnet, which converts momentum-odd spin polarization into spin-chirality locking enforced by the screw axis. Unlike curvature-induced magnetization in bent films, the nanotube is mirror-antisymmetric and produce no net magnetization. Two reciprocal effects emerge: (i) a single-spin injection drives a helical current whose handedness is fixed by the spin, yielding opposite-sign axial magnetic fields; and (ii) a time-varying axial flux generates a circumferential Faraday field that drives equal-magnitude but opposite axial charge currents in the two spin channels, producing a pure spin current under open-circuit conditions. As an implication, spin accumulation programs the tube's handedness and can imprint it onto otherwise achiral coaxial nanotubes in one-dimensional van der Waals assemblies. First-principles results for V2Se2O confirm spin-dependent helical wave functions near both band edges, establishing a nonrelativistic route to spin-programmable chiral nanodevices and compact flux generators/charge-neutral spin injectors without static magnetic bias. |
| title | Spin-Locked Helical Currents and Pure Spin Pumping in Altermagnetic Nanotubes |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2510.19700 |