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DOE OSTI ยท 3024461

Spin polarization engineering in ๐‘‘-wave altermagnets

Yarmohammadi, Mohsen [Georgetown Univ., Washington, DC (United States)] (ORCID:0000000254807569)ยทBerritta, Marco [Uppsala Univ. (Sweden)] (ORCID:0000000266897434)ยทBukov, Marin [Max Planck Society, Dresden (Germany). Max Planck Inst. for the Physics of Complex Systems] (ORCID:0000000236889599)ยทล mejkal, Libor [Max Planck Society, Dresden (Germany). Max Planck Inst. for the Physics of Complex Systems and Max Planck Institute for Chemical Physics of Solids; Czech Academy of Sciences (CAS) (Czech Republic)]ยทLinder, Jacob [Norwegian Univ. of Science and Technology, Trondheim (Norway)] (ORCID:000000030384763X)ยทOppeneer, Peter M. [Uppsala Univ. (Sweden)] (ORCID:0000000290692631)
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Abstract

Altermagnets host unconventional spin-polarized bands despite zero net magnetization, but controlling their spin structure remains challenging. Here, we theoretically propose a multifield approach to engineer spin polarization in ๐‘‘-wave altermagnets using gating, optical driving, and in-plane electric fields, which enable tunable and switchable polarizations along multiple directions. Optical driving induces out-of-plane (๐‘ง) polarization, while gating and in-plane fields generate ๐‘ฅ and ๐‘ฆ polarizations via the Edelstein effect, all of which are experimentally detectable. We further find that spin- and band-selective doping induces chiral optical activity, a feature unique to altermagnets. Our approach offers a versatile means to control the direction of spin polarization in altermagnets.

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Floquet systemsHall baraltermagnetismaltermagnetslinear response theorymagnetic susceptibilityspin polarizationultrafast magnetic effects

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Yarmohammadi, Mohsen [Georgetown Univ., Washington, DC (United States)] (ORCID:0000000254807569), Berritta, Marco [Uppsala Univ. (Sweden)] (ORCID:0000000266897434), Bukov, Marin [Max Planck Society, Dresden (Germany). Max Planck Inst. for the Physics of Complex Systems] (ORCID:0000000236889599), ล mejkal, Libor [Max Planck Society, Dresden (Germany). Max Planck Inst. for the Physics of Complex Systems and Max Planck Institute for Chemical Physics of Solids; Czech Academy of Sciences (CAS) (Czech Republic)], Linder, Jacob [Norwegian Univ. of Science and Technology, Trondheim (Norway)] (ORCID:000000030384763X), Oppeneer, Peter M. [Uppsala Univ. (Sweden)] (ORCID:0000000290692631). 2026-02-05. Spin polarization engineering in ๐‘‘-wave altermagnets. https://doi.org/10.1103/xt23-9pnv

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