Tetragonal CuMnAs is a room temperature antiferromagnet with an electrically reorientable Néel vector and a Dirac semimetal candidate. Direct measurements of the electronic structure of single-crystalline thin films of tetragonal CuMnAs using angle-resolved photoemission spectroscopy (ARPES) are reported, including Fermi surfaces (FS) and energy-wavevector dispersions. After correcting for a chemical potential shift of ≈− 390 meV (hole doping), there is excellent agreement of FS, orbital character of bands, and Fermi velocities between the experiment and density functional theory calculations. In addition, 2×1 surface reconstructions are found in the low energy electron diffraction (LEED) and ARPES. This work underscores the need to control the chemical potential in tetragonal CuMnAs to enable the exploration and exploitation of the Dirac fermions with tunable masses, which are predicted to be above the chemical potential in the present samples.

四方 CuMnAs 是一种室温反铁磁体，具有电可重定向奈尔矢量和狄拉克半金属候选体。报道了使用角分辨光电子能谱 (ARPES) 直接测量四方 CuMnAs 单晶薄膜的电子结构，包括费米面 (FS) 和能量波矢量色散。在校正 ≈− 390 meV（空穴掺杂）的化学势移后，实验和密度泛函理论计算之间的 FS、能带轨道特征和费米速度非常吻合。此外，在低能电子衍射 (LEED) 和 ARPES 中发现了 2×1 表面重建。