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Journal Articles Nature Communications Year : 2023

Magnetic excitations beyond the single- and double-magnons

Abstract

Abstract A photon carrying one unit of angular momentum can change the spin angular momentum of a magnetic system with one unit (ΔM s = ±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-Fe 2 O 3 , 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.
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Dates and versions

hal-04097591 , version 1 (15-05-2023)

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Hebatalla Elnaggar, Abhishek Nag, Maurits Haverkort, Mirian Garcia-Fernandez, Andrew Walters, et al.. Magnetic excitations beyond the single- and double-magnons. Nature Communications, 2023, 14 (1), pp.2749. ⟨10.1038/s41467-023-38341-8⟩. ⟨hal-04097591⟩
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