Magnetic excitations beyond the single- and double-magnons

Hebatalla Elnaggar (), Abhishek Nag, Maurits W. Haverkort, Mirian Garcia-Fernandez, Andrew Walters, Ru-Pan Wang, Ke-Jin Zhou () and Frank Groot ()
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Hebatalla Elnaggar: Utrecht 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
Ke-Jin Zhou: Diamond Light Source
Frank Groot: Utrecht University

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-38341-8

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