The origin and efficiency of charge-to-spin conversion, known as the Edelstein effect (EE), has been typically linked to spin-orbit coupling mechanisms, which require materials with heavy elements within a non-centrosymmetric environment. Here we demonstrate that the high efficiency of spin-charge conversion can be achieved even without spin-orbit coupling in the recently identified coplanar p-wave magnets. The non-relativistic Edelstein effect (NREE) in these magnets exhibits a distinct phenomenology compared to the relativistic EE, characterized by a strongly anisotropic response and an out-of-plane polarized spin density resulting from the spin symmetries. We illustrate the NREE through minimal tight-binding models, allowing a direct comparison to different systems. Through first-principles calculations, we further identify the nodal p-wave candidate material CeNiAsO as a high-efficiency NREE material, revealing a ~ 25 times larger response than the maximally achieved relativistic EE and other reported NREE in non-collinear magnetic systems with broken time-reversal symmetry. This highlights the potential for efficient spin-charge conversion in p-wave magnetic systems.

Department of Physics Texas A and M University College Station Texas USA

Institut für Physik Johannes Gutenberg Universität Mainz Mainz Germany

Institute of Physics Academy of Sciences of the Czech Republic Cukrovarnická 10 Praha 6 Czech Republic

Max Planck Institute for Chemical Physics of Solids Nöthnitzer Str 40 Dresden Germany

Max Planck Institute for the Physics of Complex Systems Nöthnitzer Str 38 Dresden Germany

School of Physics and Astronomy University of Nottingham Nottingham United Kingdom

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