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arXiv · 2603.05456

Manipulation of ferromagnetism with a light-driven nonlinear Edelstein-Zeeman field

Yinchuan Lv·W. Joe Meese·Azel Murzabekova·Jennifer Freedberg·Changjun Lee·Yiming Sun·Joshua Wakefield·Takashi Kurumaji·Joseph Checkelsky·Fahad Mahmood
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Abstract

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.

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Yinchuan Lv, W. Joe Meese, Azel Murzabekova, Jennifer Freedberg, Changjun Lee, Yiming Sun, Joshua Wakefield, Takashi Kurumaji, Joseph Checkelsky, Fahad Mahmood. 2026-03-05. Manipulation of ferromagnetism with a light-driven nonlinear Edelstein-Zeeman field. https://arxiv.org/abs/2603.05456

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