Peter Grünberg Institut

Keywords magnetism skyrmions neutron scattering density functional theory Introduction Magnetic skyrmions are nanometer-scale swirling spin textures that have attracted renewed interest because of their potential applications in high-density magnetic memory technologies.1,2 This possibility is based on two properties of skyrmions. First, their nontrivial topology offers them a high degree of protection against external perturbations.

We present a detailed analysis of the electronic properties of graphene/Eu/Ni(111). By using angle- and spin-resolved photoemission spectroscopy and ab initio calculations, we show that the intercalation of Eu in the graphene/Ni(111) interface gives rise to a gapped freestanding dispersion of the ππ* Dirac cones at the K¯ point with an additional lifting of the spin degeneracy due to the mixing of graphene and Eu states.

The control of any type of quantum hardware invariably necessitates time-dependent driving. If the basis depends on the control parameter, the presence of a time-dependent control field yields an extra term in the Schrödinger equation that is often neglected. Here, we examine the effect of this term in a flux-controlled Majorana junction. We show that a time-varying flux gives rise to an electromotive force, which is highly nonlinear when truncating to the junction's low-energy degrees of freedom.