Interplay between topology and magnetic excitations in topological nodal semimetal CeAlGe

Weyl semimetals (WSMs) comprise of a novel condensed matter phase that carries emergent quasiparticles of topologically nontrivial chiral Weyl fermions and represent a key recent advance in the realm of strongly spin-orbit-coupled materials. Magnetic WSMs, in which the nontrivial Weyl fermions break time-reversal symmetry, enable the possibility of further discovering unexplored spin-electronic phenomena enabling feasible spintronic applications. In this talk, I will present results obtained from neutron scattering experiments performed on predicted type-II WSM, CeAlGe. Our measurements of low-energy spin waves as well as crystal-field excitations using time-of-flight and triple-axis inelastic neutron scattering highlight phenomena intertwining its nontrivial topology with its unusually intricate magnetic structure. Through the investigation of these excitations, this study elucidates the substantial coupling between the exotic magnetic configuration and the topological semimetallic electronic structure within this material, which may see a valuable role in future practical applications.