AI Article Synopsis
- The magneto-exciton effect in two-dimensional (2D) magnets connects optics and magnetism, yet its mechanisms, especially under high magnetic fields, are not well understood.
- A study of the spin-exciton coupling in the 2D antiferromagnetic material NiPS reveals a sharp excitonic emission that splits in the presence of a magnetic field, indicating the presence of triplet-singlet exciton states.
- By analyzing the polarization of this emission and simulating spin dynamics, researchers confirm a relationship between excitonic emission and the Néel vector, shedding light on the underlying mechanisms of spin-exciton coupling in NiPS and suggesting methods for studying spin behavior in 2D magnets.
Article 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 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. Our work elucidates the mechanism behind the spin-exciton coupling in NiPS and establishes a strategy for optically probing the spin evolutions in 2D magnets.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11399334 | PMC |
| http://dx.doi.org/10.1038/s41467-024-51643-9 | DOI Listing |
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