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Magnetic excitations beyond the single- and double-magnons

Author

Listed:
  • Hebatalla Elnaggar

    (Utrecht University
    Sorbonne University)

  • Abhishek Nag

    (Diamond Light Source)

  • Maurits W. Haverkort

    (Heidelberg University)

  • Mirian Garcia-Fernandez

    (Diamond Light Source)

  • Andrew Walters

    (Diamond Light Source)

  • Ru-Pan Wang

    (Utrecht University
    University of Hamburg)

  • Ke-Jin Zhou

    (Diamond Light Source)

  • Frank Groot

    (Utrecht University)

Abstract

A photon carrying one unit of angular momentum can change the spin angular momentum of a magnetic system with one unit (ΔMs = ±1) at most. This implies that a two-photon scattering process can manipulate the spin angular momentum of the magnetic system with a maximum of two units. Herein we describe a triple-magnon excitation in α-Fe2O3, which contradicts this conventional wisdom that only 1- and 2-magnon excitations are possible in a resonant inelastic X-ray scattering experiment. We observe an excitation at exactly three times the magnon energy, along with additional excitations at four and five times the magnon energy, suggesting quadruple and quintuple-magnons as well. Guided by theoretical calculations, we reveal how a two-photon scattering process can create exotic higher-rank magnons and the relevance of these quasiparticles for magnon-based applications.

Suggested Citation

  • Hebatalla Elnaggar & Abhishek Nag & Maurits W. Haverkort & Mirian Garcia-Fernandez & Andrew Walters & Ru-Pan Wang & Ke-Jin Zhou & Frank Groot, 2023. "Magnetic excitations beyond the single- and double-magnons," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38341-8
    DOI: 10.1038/s41467-023-38341-8
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