Strong and Weak Topology Probed by Surface Science

Christian Pauly demonstrates the strong topological properties of the technologically relevant phase change materials Sb₂Te₃ and Ge₂Sb₂Te₅ by using two powerful techniques for mapping the surface electronic structure: scanning tunneling spectroscopy (STS) and angle-resolved photoemission spectroscopy (ARPES). In the case of a phase change material, this opens up the possibility of switching betwee...