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arXiv · 2606.31867

Giant perpendicular Edelstein polarization in 2D compensated magnets via bichromatic Floquet driving

Mohsen Yarmohammadi·Daegeun Jo·Marco Berritta·Libor Šmejkal·James K. Freericks·Peter M. Oppeneer
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Abstract

While unconventional $p$-wave magnets can generate nonrelativistic Edelstein polarizations, spin-group symmetries strictly forbid these responses in unconventional magnets with higher-order harmonics, such as $d$-wave altermagnets. Here, we demonstrate that combining Rashba spin-orbit coupling with bichromatic Floquet driving activates giant perpendicular Edelstein polarizations (PEPs) across 2D altermagnets and broader classes of unconventional spin-polarized magnets -- a feat monochromatic driving cannot achieve. By dynamically breaking two-fold rotational symmetry, the two-frequency drive (including bilinear, bicircular, and circular-linear configurations) induces a stray-field-free in-plane Zeeman-like field that generates orbitally dominated PEPs (0.5--1.5 $\mu_{\rm B}$). This massive response is governed by universal selection rules tied to the system's magnetic parity and the second beam's harmonics. These emergent PEPs provide a powerful mechanism for perpendicular memory writing.

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Mohsen Yarmohammadi, Daegeun Jo, Marco Berritta, Libor Šmejkal, James K. Freericks, Peter M. Oppeneer. 2026-06-30. Giant perpendicular Edelstein polarization in 2D compensated magnets via bichromatic Floquet driving. https://arxiv.org/abs/2606.31867

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