Tetragonal CuMnAs is a room temperature antiferromagnet with an electrically reorientable N\'eel 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. Additionally, 2x1 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.
@article{arxiv.2210.03818,
title = {Experimental electronic structure of the electrically switchable antiferromagnet CuMnAs},
author = {A. Garrison Linn and Peipei Hao and Kyle N. Gordon and Dushyant Narayan and Bryan S. Berggren and Nathaniel Speiser and Sonka Reimers and Richard P. Campion and Vít Novák and Sarnjeet S. Dhesi and Timur Kim and Cephise Cacho and Libor Šmejkal and Tomáš Jungwirth and Jonathan D. Denlinger and Peter Wadley and Dan Dessau},
journal= {arXiv preprint arXiv:2210.03818},
year = {2022}
}
Comments
Submitted to Physical Review X. 20 pages. 9 figures