In an article published in the high impact journal NATURE , opens an external URL in a new windowon 18 December 2019, Gunther Springholz, together with Oliver Rader (Helmholtz Zentrum / BESSY Berlin), reports about their recent experimental proof and measurement of a magnetic bandgap in a magnetically doped topological insulator that enables the quantum anomalous Hall effect (QAHE), which provides quantized edge states for lossless charge-transport applications.