Novel magnetic excitations beyond the single- and double-magnons
Abstract
Conventional wisdom suggests that one photon that carries one unit of angular momentum can change the spin angular momentum of a magnetic system with one unit (delta Ms = +-1) at most. This would imply that a two-photon scattering process can manipulate the spin angular momentum of the magnetic system with a maximum of two units. Here we examine the fundamental limit of the photon-driven transport of angular momentum by studying the magnon spectrum of {\alpha}-Fe2O3 using resonant inelastic x-ray scattering. We discovered a cascade of higher-rank magnons carrying double, triple, quadruple, and quintuple the spin angular momentum of a single-magnon. Guided by theoretical calculations, we reveal how a two-photons scattering process can create exotic higher-rank magnons and the relevance of these quasiparticles for magnon-based applications.
Keywords
Cite
@article{arxiv.2208.03198,
title = {Novel magnetic excitations beyond the single- and double-magnons},
author = {Hebatalla Elnaggar and Abhishek Nag and Maurits W. Haverkort and Ke-jin Zhou and Frank de Groot},
journal= {arXiv preprint arXiv:2208.03198},
year = {2023}
}
Comments
Work presented as an invited talk by Hebatalla Elnaggar at the IXS conference 2021 https://www.bnl.gov/rixsrexs2021/