Origin of the Magnetic Exciton in the van der Waals Antiferromagnet NiPS3

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Abstract

An ultrasharp photoluminescence line intimately related to antiferromagnetic order has been found in NiPS3, a correlated van der Waals material, opening prospects for magneto-optical coupling schemes and spintronic applications. Here we unambiguously clarify the singlet origin of this excitation, confirming its roots in the spin structure. Based on a comprehensive investigation of the electronic structure using angle-resolved photoemission and q-dependent electron energy loss spectroscopy as experimental tools we develop, in a first step, an adequate theoretical understanding using density functional theory (DFT). In a second step the DFT is used as input for a dedicated multiplet theory by which we achieve excellent agreement with available multiplet spectroscopy. Our Letter connects the understanding of the electronic structure and of optical processes in NiPS3 and related materials as a prerequisite for further progress of the field.

Details

Original languageEnglish
Article number256504
Number of pages7
JournalPhysical review letters
Volume131
Issue number25
Publication statusPublished - 22 Dec 2023
Peer-reviewedYes

External IDs

PubMed 38181357

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