Topological magneto-optical Kerr effect without spin-orbit coupling in spin-compensated antiferromagnet.

Camron Farhang, Weihang Lu, Kai Du, Yunpeng Gao, Junjie Yang, Sang-Wook Cheong, Jing Xia

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Article in Nature communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

7 authors.

Camron Farhang *Department of Physics and Astronomy, University of California, Irvine, Irvine, CA, USA.

Weihang Lu *Department of Physics and Astronomy, University of California, Irvine, Irvine, CA, USA.

Kai DuKeck Center for Quantum Magnetism and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, USA.ORCID http://orcid.org/0000-0002-4112-0995

Yunpeng GaoDepartment of Physics, New Jersey Institute of Technology, Newark, NJ, USA.

Junjie YangDepartment of Physics, New Jersey Institute of Technology, Newark, NJ, USA.

Sang-Wook CheongKeck Center for Quantum Magnetism and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, USA.ORCID http://orcid.org/0000-0001-9905-6175

Jing XiaDepartment of Physics and Astronomy, University of California, Irvine, Irvine, CA, USA. xia.jing@uci.edu.ORCID http://orcid.org/0000-0001-6780-8926

Funding

Gordon and Betty Moore Foundation (Gordon E. and Betty I. Moore Foundation) GBMF10276National Science Foundation (NSF) DMR-2419425

6 · The paper itself

Abstract

The magneto-optical Kerr effect (MOKE), the differential reflection of oppositely circularly polarized light, has traditionally been associated with relativistic spin-orbit coupling (SOC), which links a particle's spin with its orbital motion. In ferromagnets, large MOKE signals arise from the combination of magnetization and SOC, while in certain coplanar antiferromagnets, SOC-induced Berry curvature enables MOKE despite zero net magnetization. Theoretically, large MOKE can also arise in a broader class of magnetic materials with compensated spins, without relying on SOC - for example, in systems exhibiting real-space scalar spin chirality. The experimental verification has remained elusive. Here, we demonstrate such a SOC- and magnetization-free MOKE in the noncoplanar antiferromagnet Co

Identifiers

PMID41775743

DOI10.1038/s41467-026-70238-0

PMCPMC13065855

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