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| Format: | Preprint |
| Veröffentlicht: |
2026
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| Online-Zugang: | https://arxiv.org/abs/2604.12726 |
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| _version_ | 1866910128991633408 |
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| author | Zhang, Shihao |
| author_facet | Zhang, Shihao |
| contents | Altermagnets represent a novel category of magnetic materials characterized by zero net magnetization yet featuring spin-split band structures, and they demonstrate distinctive orbital-spin locking phenomena. Commencing from the minimal multi-orbital tight-binding Hamiltonian of d-wave altermagnets, we conduct an analysis of the general formulas for the third-order injection and shift currents. These currents are solely determined by the quantum metric and quantum connection, being free from Berry curvature contamination. In the ideal scenario where the $δ$-bond hopping $V_δ$ approaches zero ($V_δ= 0$), we derive closed-form analytical solutions for the third-order photoconductivities. For the general situation with a finite value of $V_δ$, we present a perturbative analytical solution within the limit of $V_δ\ll V_π$, and this solution is verified through numerical calculations. Our research establishes a comprehensive theoretical description of the third-order optospintronic responses in d-wave altermagnets based on a microscopic model. Moreover, it offers a viable approach for the experimental observation of pure quantum geometric effects. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_12726 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Third-order optical response in d-wave altermagnets: Analytical and numerical results from microscopic model Zhang, Shihao Mesoscale and Nanoscale Physics Materials Science Altermagnets represent a novel category of magnetic materials characterized by zero net magnetization yet featuring spin-split band structures, and they demonstrate distinctive orbital-spin locking phenomena. Commencing from the minimal multi-orbital tight-binding Hamiltonian of d-wave altermagnets, we conduct an analysis of the general formulas for the third-order injection and shift currents. These currents are solely determined by the quantum metric and quantum connection, being free from Berry curvature contamination. In the ideal scenario where the $δ$-bond hopping $V_δ$ approaches zero ($V_δ= 0$), we derive closed-form analytical solutions for the third-order photoconductivities. For the general situation with a finite value of $V_δ$, we present a perturbative analytical solution within the limit of $V_δ\ll V_π$, and this solution is verified through numerical calculations. Our research establishes a comprehensive theoretical description of the third-order optospintronic responses in d-wave altermagnets based on a microscopic model. Moreover, it offers a viable approach for the experimental observation of pure quantum geometric effects. |
| title | Third-order optical response in d-wave altermagnets: Analytical and numerical results from microscopic model |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2604.12726 |