Correlation between Exciton Dynamics and Spin Structure in van der Waals Antiferromagnet NiPS3

TL;DR

This study explores how exciton dynamics in NiPS3, a van der Waals antiferromagnet, are linked to its spin structure, revealing potential for ultrafast spintronic applications through coupled carrier, lattice, and spin interactions.

Contribution

It uncovers the connection between exciton recombination rates and magnetic order in NiPS3, highlighting the interplay of spin, charge, and lattice dynamics in vdW antiferromagnets.

Findings

Exciton formation is independent of magnetic degrees of freedom.

Recombination rate is linked to long-range magnetic order.

Coupling between carrier, lattice, and spin dynamics is demonstrated.

Abstract

The emerging magnetic van der Waals (vdW) materials provide a platform for exploring novel physics regarding magnetism in low dimensions and developing ultrathin spintronic applications. Here, we investigate the ultrafast dynamics of excitons in a vdW NiPS3 crystal. The temporal evolution of the transient reflection spectra indicates that the spin-correlated exciton is formed through photocarrier localization, the rate of which is independent of the magnetic degrees of freedom. However, the recombination rate of these excitons is connected with the long-range magnetic order, and this connection probably arise from a spin-flip rooted in the underlying antiferromagnetic background during the recombination. Our findings uncover intertwined coupling between carrier, lattice and spin degrees of freedom in NiPS3, which may pave the path toward ultrafast optical manipulation of spin-related quantum states in vdW antiferromagnets.