Temperature-dependent electronic structure in a higher-order topological insulator candidate EuIn2As 2

The interplay of magnetism and topology has been shown to give rise to various magnetic topological states. In this talk, we will present a systematic study on the electronic structure of EuIn2As2 – predicted to host axion insulating as well as higher-order topological insulating phases – and its evolution across the antiferromagnetic transition below 16 K by utilizing high-resolution angle-resolved photoemission spectroscopy combined with parallel first-principles computation. We directly observe the linearly dispersing hole-like bands crossing the Fermi level and the change in their dispersion across the magnetic phase transition. Our study points to EuIn2As2 as being a promising material to explore interplay between topology and magnetism.