Magnetic excitations beyond the single- and double-magnons.
Hebatalla ElnaggarAbhishek NagMaurits W HaverkortMirian Garcia-FernandezAndrew C WaltersRu-Pan WangKe-Jin ZhouFrank de GrootPublished in: Nature communications (2023)
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.
Keyphrases
- monte carlo
- molecularly imprinted
- density functional theory
- living cells
- energy transfer
- room temperature
- single molecule
- helicobacter pylori
- high resolution
- genome wide
- magnetic resonance imaging
- single cell
- molecular dynamics simulations
- magnetic resonance
- computed tomography
- simultaneous determination
- solid phase extraction
- dual energy