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arXiv · 2510.07996

Evidence for Magnon-Assisted Exciton Radiation in a Layered Antiferromagnetic Semiconductor

Yingchen Peng·Yanan Ge·Wentao Chen·Zihan Wang·Kang Wang·Kezhao Du·Xingzhi Wang·Ye Yang
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Abstract

Layered van der Waals (vdW) magnetic semiconductors open a new avenue for exploring intertwined excitonic and magnetic phenomena. Here, we investigate this interplay in the vdW antiferromagnet MnPS3, uncovering an exceptionally long exciton lifetime (~100 {\mu}s) below the N\'eel temperature (T_N). We demonstrate that the exciton lifetime is governed by phonon-assisted nonradiative recombination and thus exhibits a strong temperature dependence. In contrast, the exciton radiative recombination shows a distinct temperature dependence that is sensitive to magnetic order. Below T_N, the temperature dependence of the radiative recombination rate is consistent with a magnon-assisted emission pathway, while above T_N it reflects the combined effects of short-range spin correlations and phonons. These findings not only establish MnPS3 as a compelling candidate for excitonic devices due to its long-lifetime and correlation with magnetic orders but also provide crucial insights into the interplay between excitons, spins, and lattice in vdW magnetic semiconductors.

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Yingchen Peng, Yanan Ge, Wentao Chen, Zihan Wang, Kang Wang, Kezhao Du, Xingzhi Wang, Ye Yang. 2025-10-09. Evidence for Magnon-Assisted Exciton Radiation in a Layered Antiferromagnetic Semiconductor. https://arxiv.org/abs/2510.07996

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