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arXiv · 2606.25470

Spin-flip optical excitations in van der Waals antiferromagnet CrPS$_4$

Dipankar Jana·Aljoscha Soll·Zdenek Sofer·Milan Orlita·Clement Faugeras·Maciej Koperski·Marek Potemski
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Abstract

We investigate the near-infrared optical response of the semiconducting van der Waals antiferromagnet CrPS$_4$ and identify previously unreported spin-entangled optical resonances. The strong and anisotropic magnetic-field dependence of these resonances reflects the underlying magnetic order and confirms the biaxial antiferromagnetic nature of CrPS$_4$. From the magnetic field evolution of the optical transition, we extract key magnetic parameters, including the spin-flop ($\approx0.9$~T) and spin-saturation ($\approx8$~T) fields. These results demonstrate a potential pathway for all-optical probing of spin states in van der Waals antiferromagnets, with relevance for spin-sensitive optoelectronic and magneto-optical devices.

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Dipankar Jana, Aljoscha Soll, Zdenek Sofer, Milan Orlita, Clement Faugeras, Maciej Koperski, Marek Potemski. 2026-06-24. Spin-flip optical excitations in van der Waals antiferromagnet CrPS$_4$. https://doi.org/10.1021/acs.nanolett.6c01101

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