Spin-Axis Dynamic Locking
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866909918902091776 |
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| author | Zhiheng, Lv Jiangtao, Cai Dengpan, Ma Yan, Xing Zhifeng, Liu |
| author_facet | Zhiheng, Lv Jiangtao, Cai Dengpan, Ma Yan, Xing Zhifeng, Liu |
| contents | The all-electrical realization of highly spin-polarized charge currents and their efficient conversion into pure spin currents remains a fundamental challenge in spintronics. Here, we report a spin-axis dynamic locking (SADL) effect in altermagnets that pins the spin polarization to the crystalline axes: an in-plane electric field along one principal axis drives a fully spin-up charge current, whereas along the orthogonal axis, it generates an equal spin-down current. Consequently, applying an electric field diagonally yields a transverse pure spin current with 100% charge-to-spin conversion efficiency. Mechanistically, SADL originates in a distinctive tent state characterized by alternating spin-split flat bands and orthogonal Fermi-surface lines. High-throughput first-principles screening confirms SADL in broad materials (e.g., 2D Cr2WSe4 monolayer and a synthesized three-dimensional compound, (BaF)2Mn2Se2O). Our work thus opens a route to ultra-low-power, reconfigurable spintronic devices where the spin states are governed solely by electric field orientation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_18476 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spin-Axis Dynamic Locking Zhiheng, Lv Jiangtao, Cai Dengpan, Ma Yan, Xing Zhifeng, Liu Other Condensed Matter The all-electrical realization of highly spin-polarized charge currents and their efficient conversion into pure spin currents remains a fundamental challenge in spintronics. Here, we report a spin-axis dynamic locking (SADL) effect in altermagnets that pins the spin polarization to the crystalline axes: an in-plane electric field along one principal axis drives a fully spin-up charge current, whereas along the orthogonal axis, it generates an equal spin-down current. Consequently, applying an electric field diagonally yields a transverse pure spin current with 100% charge-to-spin conversion efficiency. Mechanistically, SADL originates in a distinctive tent state characterized by alternating spin-split flat bands and orthogonal Fermi-surface lines. High-throughput first-principles screening confirms SADL in broad materials (e.g., 2D Cr2WSe4 monolayer and a synthesized three-dimensional compound, (BaF)2Mn2Se2O). Our work thus opens a route to ultra-low-power, reconfigurable spintronic devices where the spin states are governed solely by electric field orientation. |
| title | Spin-Axis Dynamic Locking |
| topic | Other Condensed Matter |
| url | https://arxiv.org/abs/2509.18476 |