Infrared study of the interplay of charge, spin, and lattice excitations in the magnetic topological insulator EuIn${}_2$As${}_2$

B. Xu, P. Marsik, S. Sarkar +4

We report an infrared spectroscopy study of the axion topological insulator candidate EuIn${}_2$As${}_2$ for which the Eu moments exhibit an A-type antiferromagnetic (AFM) order below…