Unveiling the spin evolution in van der Waals antiferromagnets via magneto-exciton effects.
basic_science · Level V
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- Record sourced from PubMed, PMID 39271660.
- Also identified by DOI 10.1038/s41467-024-51643-9 and PMC identifier 11399334.
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Abstract
Among the fascinating phenomena observed in two-dimensional (2D) magnets, the magneto-exciton effect stands out as a pivotal link between optics and magnetism. Although the excitonic effect has been revealed and exhibits a considerable correlation with the spin structures in certain 2D magnets, the underlying mechanism of the magneto-exciton effect remains underexplored, especially under high magnetic fields. Here we perform a systematic investigation of the spin-exciton coupling in 2D antiferromagnetic NiPS<sub>3</sub> under high magnetic fields. When an in-plane magnetic field is applied, the exceptional sharp excitonic emission at ~1.4756 eV exhibits a Zeeman-like splitting with g ≈ 2.0, experimentally identifying the exciton as an excitation of dominant triplet-singlet character. By examining the polarization of excitonic emission and simulating the spin evolution, we further verify the correlation between excitonic emission and Néel vector in NiPS<sub>3</sub>. Our work elucidates the mechanism behind the spin-exciton coupling in NiPS<sub>3</sub> and establishes a strategy for optically probing the spin evolutions in 2D magnets.