Magneto-optical spectroscopy on Weyl nodes for anomalous and topological Hall effects in chiral MnGe

Abstract

Previous work has proposed that the anomalous and topological Hall effects, associated with Weyl nodes, should have a signature in optical conductivity. Here, using THz optical spectroscopy, the authors assign these two effects to optical conductivity resonances, arising near band anti-crossings, in thin films of MnGe.