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

Author

Listed:
  • W. He

    (Brookhaven National Laboratory)

  • Y. Shen

    (Brookhaven National Laboratory)

  • K. Wohlfeld

    (University of Warsaw)

  • J. Sears

    (Brookhaven National Laboratory)

  • J. Li

    (Brookhaven National Laboratory)

  • J. Pelliciari

    (Brookhaven National Laboratory)

  • M. Walicki

    (University of Warsaw)

  • S. Johnston

    (The University of Tennessee
    The University of Tennessee)

  • E. Baldini

    (The University of Texas at Austin)

  • V. Bisogni

    (Brookhaven National Laboratory)

  • M. Mitrano

    (Harvard University)

  • M. P. M. Dean

    (Brookhaven National Laboratory)

Abstract

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.

Suggested Citation

  • W. He & Y. Shen & K. Wohlfeld & J. Sears & J. Li & J. Pelliciari & M. Walicki & S. Johnston & E. Baldini & V. Bisogni & M. Mitrano & M. P. M. Dean, 2024. "Magnetically propagating Hund’s exciton in van der Waals antiferromagnet NiPS3," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47852-x
    DOI: 10.1038/s41467-024-47852-x
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    References listed on IDEAS

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    1. Kenneth S. Burch & David Mandrus & Je-Geun Park, 2018. "Magnetism in two-dimensional van der Waals materials," Nature, Nature, vol. 563(7729), pages 47-52, November.
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