Magnetic excitations beyond the single- and double-magnons

• Verfasst von: Elnaggar, Hebatalla [VerfasserIn]
• Verfasst von: Nag, Abhishek [VerfasserIn]
• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Verfasst von: Garcia-Fernandez, Mirian [VerfasserIn]
• Verfasst von: Walters, Andrew [VerfasserIn]
• Verfasst von: Wang, Ru-Pan [VerfasserIn]
• Verfasst von: Zhou, Ke-Jin [VerfasserIn]
• Verfasst von: de Groot, Frank [VerfasserIn]
• Titel: Magnetic excitations beyond the single- and double-magnons
• Verf.angabe: Hebatalla Elnaggar, Abhishek Nag, Maurits W. Haverkort, Mirian Garcia-Fernandez, Andrew Walters, Ru-Pan Wang, Ke-Jin Zhou & Frank de Groot
• E-Jahr: 2023
• Jahr: 12 May 2023
• Umfang: 8 S.
• Fussnoten: Gesehen am 25.09.2023
• Titel Quelle: Enthalten in: Nature Communications
• Ort Quelle: [London] : Nature Publishing Group UK, 2010
• Jahr Quelle: 2023
• Band/Heft Quelle: 14(2023), Artikel-ID 2749, Seite 1-8
• ISSN Quelle: 2041-1723
• DOI: doi:10.1038/s41467-023-38341-8
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Magnetic properties and materials
• K10plus-PPN: 1860199267

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.