Visualization of Isospin Momentum Texture of Dirac Magnons and Excitons in a Honeycomb Quantum Magnet*

Band topology in electronic systems is known to have profound consequences on various observable properties in semi-metals and certain insulators. Insights from this field have reached into many areas of physics and in this talk we describe certain universal signatures of band topology in propagating bosonic quasi-particles. We show that the Dirac magnon material CoTiO3 provides an experimental demonstration of a universal winding of the inelastic neutron scattering intensity around linear touching points of magnetic excitations - magnons and spin-orbit excitons - that originates from the isospin texture of the quasiparticle wavefunction in momentum space. https://arxiv.org/abs/2007.04199