Out-of-Plane Nonlinear Orbital Hall Torque
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866909900639043584 |
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| author | Wang, Hui Feng, Xukun Cao, Jin Liu, Huiying Gao, Weibo Xiao, Cong Yang, Shengyuan A. Ang, Lay Kee |
| author_facet | Wang, Hui Feng, Xukun Cao, Jin Liu, Huiying Gao, Weibo Xiao, Cong Yang, Shengyuan A. Ang, Lay Kee |
| contents | Despite recent advances in orbitronics, generating out-of-plane orbital torques essential for field-free deterministic switching of perpendicular magnetization remains a key challenge. Here, we propose a strategy to produce such unconventional torques across broad classes of materials, by leveraging the nonlinear orbital Hall effect. We demonstrate that this nonlinear orbital response is dramatically amplified by topological band degeneracies, where it overwhelmingly dominates the spin response even in systems with strong spin-orbit coupling. These features are confirmed via a quantitative investigation of representative topological metals RhSi, YPtBi, and PbTaSe$_2$, by combining our theory with first-principles calculations. The resulting orbital torques substantially surpass those from linear mechanisms reported thus far. These findings propel the research of orbital transport into the nonlinear regime, broaden the scope of orbital source materials, and establish a new pathway towards high-performance orbitronic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_10314 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Out-of-Plane Nonlinear Orbital Hall Torque Wang, Hui Feng, Xukun Cao, Jin Liu, Huiying Gao, Weibo Xiao, Cong Yang, Shengyuan A. Ang, Lay Kee Materials Science Despite recent advances in orbitronics, generating out-of-plane orbital torques essential for field-free deterministic switching of perpendicular magnetization remains a key challenge. Here, we propose a strategy to produce such unconventional torques across broad classes of materials, by leveraging the nonlinear orbital Hall effect. We demonstrate that this nonlinear orbital response is dramatically amplified by topological band degeneracies, where it overwhelmingly dominates the spin response even in systems with strong spin-orbit coupling. These features are confirmed via a quantitative investigation of representative topological metals RhSi, YPtBi, and PbTaSe$_2$, by combining our theory with first-principles calculations. The resulting orbital torques substantially surpass those from linear mechanisms reported thus far. These findings propel the research of orbital transport into the nonlinear regime, broaden the scope of orbital source materials, and establish a new pathway towards high-performance orbitronic devices. |
| title | Out-of-Plane Nonlinear Orbital Hall Torque |
| topic | Materials Science |
| url | https://arxiv.org/abs/2511.10314 |