Intrinsic Dynamic Generation of Spin Polarization by Time-Varying Electric Field
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916936427765760 |
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| author | Feng, Xukun Cao, Jin Zhang, Zhi-Fan Ang, Lay Kee Lai, Shen Jiang, Hua Xiao, Cong Yang, Shengyuan A. |
| author_facet | Feng, Xukun Cao, Jin Zhang, Zhi-Fan Ang, Lay Kee Lai, Shen Jiang, Hua Xiao, Cong Yang, Shengyuan A. |
| contents | Electric control of spin in insulators is desired for low-consumption and ultrafast spintronics, but the underlying mechanism remains largely unexplored. Here, we propose an intrinsic effect of dynamic spin generation driven by time-varying electric field. In the intraband response regime, it can be nicely formulated as a Berry curvature effect and leads to two phenomena that are forbidden in the $dc$ limit: linear spin generation in nonmagnetic insulators and intrinsic N{é}el spin-orbit torque in $\mathcal{PT}$-symmetric antiferromagnetic insulators. These phenomena are driven by the time derivative of field rather than the field itself, and have a quantum origin in the first-order dynamic anomalous spin polarizability. Combined with first-principles calculations, we predict sizable effects driven by terahertz field in nonmagnetic monolayer Bi and in antiferromagnetic even-layer MnBi$_2$Te$_4$, which can be detected in experiment. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_09669 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Intrinsic Dynamic Generation of Spin Polarization by Time-Varying Electric Field Feng, Xukun Cao, Jin Zhang, Zhi-Fan Ang, Lay Kee Lai, Shen Jiang, Hua Xiao, Cong Yang, Shengyuan A. Mesoscale and Nanoscale Physics Electric control of spin in insulators is desired for low-consumption and ultrafast spintronics, but the underlying mechanism remains largely unexplored. Here, we propose an intrinsic effect of dynamic spin generation driven by time-varying electric field. In the intraband response regime, it can be nicely formulated as a Berry curvature effect and leads to two phenomena that are forbidden in the $dc$ limit: linear spin generation in nonmagnetic insulators and intrinsic N{é}el spin-orbit torque in $\mathcal{PT}$-symmetric antiferromagnetic insulators. These phenomena are driven by the time derivative of field rather than the field itself, and have a quantum origin in the first-order dynamic anomalous spin polarizability. Combined with first-principles calculations, we predict sizable effects driven by terahertz field in nonmagnetic monolayer Bi and in antiferromagnetic even-layer MnBi$_2$Te$_4$, which can be detected in experiment. |
| title | Intrinsic Dynamic Generation of Spin Polarization by Time-Varying Electric Field |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2409.09669 |