Magnetically propagating Hund’s exciton in van der Waals antiferromagnet NiPS3

He, Wei; Shen, Yao; Wohlfeld, Krzysztof; Sears, J.; Li, J.; Pelliciari, Jonathan; Walicki, Mikolaj; Johnston, S.; Baldini, Edoardo; Bisogni, Valentina; Mitrano, Matteo; Dean, Mark P. M.

doi:10.1038/s41467-024-47852-x

Title: Magnetically propagating Hund’s exciton in van der Waals antiferromagnet NiPS₃

Journal Article · 24 April 2024 · Nature Communications

DOI: https://doi.org/10.1038/s41467-024-47852-x · OSTI ID:2331227

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Brookhaven National Laboratory (BNL), Upton, NY (United States)
Univ. of Warsaw (Poland)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Texas, Austin, TX (United States)
Harvard Univ., Cambridge, MA (United States)

Magnetic van der Waals (vdW) materials have opened new frontiers for realizing novel many-body phenomena. Recently NiPS₃ has received intense interest since it hosts an excitonic quasiparticle whose properties appear to be intimately linked to the magnetic state of the lattice. Despite extensive studies, the electronic character, mobility, and magnetic interactions of the exciton remain unresolved. Here we address these issues by measuring NiPS₃ with ultra-high energy resolution resonant inelastic x-ray scattering (RIXS). We find that Hund’s exchange interactions are primarily responsible for the energy of formation of the exciton. Measuring the dispersion of the Hund’s exciton reveals that it propagates in a way that is analogous to a double-magnon. We trace this unique behavior to fundamental similarities between the NiPS₃ exciton hopping and spin exchange processes, underlining the unique magnetic characteristics of this novel quasiparticle.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); US Army Research Office (ARO); National Science Foundation (NSF)

Grant/Contract Number:: SC0012704

OSTI ID:: 2331227

Alternate ID(s):: OSTI ID: 2340941; OSTI ID: 2370324

Report Number(s):: BNL--225384-2024-JAAM; BNL--225675-2024-JAAM

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Magnetically propagating Hund’s exciton in van der Waals antiferromagnet NiPS₃