Manipulation of ferromagnetism with a light-driven nonlinear Edelstein-Zeeman field
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866912945652367360 |
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| author | Lv, Yinchuan Meese, W. Joe Murzabekova, Azel Freedberg, Jennifer Lee, Changjun Sun, Yiming Wakefield, Joshua Kurumaji, Takashi Checkelsky, Joseph Mahmood, Fahad |
| author_facet | Lv, Yinchuan Meese, W. Joe Murzabekova, Azel Freedberg, Jennifer Lee, Changjun Sun, Yiming Wakefield, Joshua Kurumaji, Takashi Checkelsky, Joseph Mahmood, Fahad |
| contents | Optical control of magnetization is often symmetry-forbidden because electric fields and magnetization transform differently under inversion and time-reversal. However, through even-order nonlinear response, optical excitation can generate a nonequilibrium magnetic density (the nonlinear Edelstein effect) that acts as an internal Edelstein-Zeeman field coupling to slower magnetic degrees of freedom. Here we demonstrate non-thermal, ultrafast optical control of ferromagnetism in the centrosymmetric van der Waals semiconductor Cr$_2$Ge$_2$Te$_6$ via a resonant nonlinear Edelstein effect. Using time-domain THz emission spectroscopy under near-infrared excitation, we directly observe magnetic dipole radiation arising from optically driven magnetization dynamics. The polarization, fluence, and temperature dependences of the THz emission are quantitatively captured by a mean-field description of a weakly anisotropic Heisenberg ferromagnet subject to an Edelstein-Zeeman field. Our results establish a general nonequilibrium route to optical control of magnetism in centrosymmetric materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_05456 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Manipulation of ferromagnetism with a light-driven nonlinear Edelstein-Zeeman field Lv, Yinchuan Meese, W. Joe Murzabekova, Azel Freedberg, Jennifer Lee, Changjun Sun, Yiming Wakefield, Joshua Kurumaji, Takashi Checkelsky, Joseph Mahmood, Fahad Mesoscale and Nanoscale Physics Strongly Correlated Electrons Optical control of magnetization is often symmetry-forbidden because electric fields and magnetization transform differently under inversion and time-reversal. However, through even-order nonlinear response, optical excitation can generate a nonequilibrium magnetic density (the nonlinear Edelstein effect) that acts as an internal Edelstein-Zeeman field coupling to slower magnetic degrees of freedom. Here we demonstrate non-thermal, ultrafast optical control of ferromagnetism in the centrosymmetric van der Waals semiconductor Cr$_2$Ge$_2$Te$_6$ via a resonant nonlinear Edelstein effect. Using time-domain THz emission spectroscopy under near-infrared excitation, we directly observe magnetic dipole radiation arising from optically driven magnetization dynamics. The polarization, fluence, and temperature dependences of the THz emission are quantitatively captured by a mean-field description of a weakly anisotropic Heisenberg ferromagnet subject to an Edelstein-Zeeman field. Our results establish a general nonequilibrium route to optical control of magnetism in centrosymmetric materials. |
| title | Manipulation of ferromagnetism with a light-driven nonlinear Edelstein-Zeeman field |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2603.05456 |