Interplay between magnetism and band topology in Dirac/Weyl semimetals
Phenomena emerging from relativistic electrons in solids have become one of the main topical subjects in condensed matter physics. Among a wealth of intriguing new phenomena, several classes of materials with a non-trivial band topology have emerged, including 2-dimensional materials (graphene, …), topological insulators (Bi2Se3, Bi2Te3, …), and topological Dirac semimetals (Na3Bi and Cd3As2). Although the physics underlying the functionality of these new materials is completely different from that of conventional electronic/magnetic materials; the electronic, magnetic and topological phenomena can be tuned using equivalent approaches (doping and alloying). While it is known that the functional properties are strongly dependent on the local structure of dopants and alloying elements, these effects are poorly understood (if at all) in these new materials. This thesis is specifically targeted to close this understanding gap, through a unique experimental approach that combines radioactive ion beams (at the ISOLDE facility at CERN) and high-brilliance X-ray radiation (at synchrotron facilities).