Magnetic excitons in a suspended 2D antiferromagnetic membrane

Joanna L. P. Wolff; Loïc Moczko; Jérémy Thoraval; Michelangelo Romeo; Benjamin Bacq-Labreuil; Stéphane Berciaud; Arnaud Gloppe

arXiv · 2512.20528

Magnetic excitons in a suspended 2D antiferromagnetic membrane

Joanna L. P. Wolff·Loïc Moczko·Jérémy Thoraval·Michelangelo Romeo·Benjamin Bacq-Labreuil·Stéphane Berciaud·Arnaud Gloppe

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Abstract

Layered magnetic and strongly correlated materials present a rich platform for condensed matter physics with intrinsic properties intertwined by magnetism and low-dimensionality. A suspended light-emitting 2D antiferromagnetic membrane forms a highly controllable hybrid system in which the interplay between spin ordering, optical and mechanical degrees of freedom can be uniquely explored. NiPS$_3$ hosts excitons responsible for a puzzling luminescence down to a few atomic layers, linked to its zigzag antiferromagnetic order. The nature of these excitons remains unclear. Here we report on the magnetic excitons of a suspended few-layer NiPS$_3$ membrane. We reveal nematic zigzag states and study the optical transitions induced by the magnon-mediated motion of the excitation in the magnetic lattice, resulting in magnon-dressed excitons. We observe a strain tuning of these emission lines, dependent on their microscopic origin, with rates that sign a strong localization of the magnetic excitons, fading with the number of magnon-mediated hops.

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Joanna L. P. Wolff, Loïc Moczko, Jérémy Thoraval, Michelangelo Romeo, Benjamin Bacq-Labreuil, Stéphane Berciaud, Arnaud Gloppe. 2025-12-23. Magnetic excitons in a suspended 2D antiferromagnetic membrane. https://arxiv.org/abs/2512.20528

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