Molecular beam epitaxy of superconducting FeSexTe1−x thin films interfaced with magnetic topological insulators

The observation of Majorana anyons is a long-sought challenge in physics, but has been hindered by lack of high-quality materials. The authors fabricate a heterostructure with an atomically sharp interface between a quantum anomalous Hall insulator and superconductor, for the first time. This unique quantum material should enable the unambiguous observation of chiral Majorana edge states and braiding of non-Abelian anyons without magnetic field.