Figure 9.

Temperature evolution of the differential conductance spectra in an out-of-plane magnetic field of 17.5 T is indicative of elastic and inelastic tunnelling processes mediated by magnons. The experimental data (a) shows qualitative agreement with theoretical predictions (b), which consider inelastic scattering processes with an emission of a magnon and elastic tunnelling processes involving two magnons. Both processes can be distinguished by applying a bias which shifts the mutual alignment of Landau levels (LLs) in the graphene electrodes (c, d). All panels adapted with permission from ref (131). Copyright 2018 Springer Nature.