Experimental electronic structure of the switchable, topological, antiferromagnet CuMnAs

Electrical switching and read out of the AFM Néel vector orientation in tetragonal CuMnAs has
been experimentally demonstrated to be scalable to THz speeds, far exceeding speeds in state-
of-the-art memory devices today. Additionally, CuMnAs is predicted to host two Dirac points
protected by a nonsymorphic, glide mirror plane symmetry, which may or may not exist
depending on the orientation of the Néel vector, offering the possibility of opening and closing a gap at the Dirac point at THz speeds. Until now, we lacked experimental confirmation of the predicted electronic band structure, but here we report the electronic structure of tetragonal CuMnAs experimentally measured with ARPES, which we compare to DFT. We performed experiments on the (001) surface of tetragonal CuMnAs thin films, measuring Fermi surfaces, kz dispersion, and high symmetry cuts.