Experimental electronic structure of the electrically switchable antiferromagnet CuMnAs

Linn, A. Garrison; Hao, Peipei; Gordon, Kyle N.; Narayan, Dushyant; Berggren, Bryan S.; Speiser, Nathaniel; Reimers, Sonka; Campion, Richard P.; Novák, Vít; Dhesi, Sarnjeet S.; Kim, Timur K.; Cacho, Cephise; Šmejkal, Libor; Jungwirth, Tomáš; Denlinger, Jonathan D.; Wadley, Peter; Dessau, Daniel S.

Abstract

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.

Citation

Linn, A. G., Hao, P., Gordon, K. N., Narayan, D., Berggren, B. S., Speiser, N., Reimers, S., Campion, R. P., Novák, V., Dhesi, S. S., Kim, T. K., Cacho, C., Šmejkal, L., Jungwirth, T., Denlinger, J. D., Wadley, P., & Dessau, D. S. (2023). Experimental electronic structure of the electrically switchable antiferromagnet CuMnAs. npj Quantum Materials, 8(1), Article 19. https://doi.org/10.1038/s41535-023-00554-x

• Journal Article Type: Article
• Acceptance Date: Apr 17, 2023
• Online Publication Date: May 3, 2023
• Publication Date: 2023
• Deposit Date: Aug 1, 2023
• Publicly Available Date: Aug 1, 2023
• Journal: npj Quantum Materials
• Print ISSN: 2397-4648
• Electronic ISSN: 2397-4648
• Publisher: Nature Research
• Peer Reviewed: Peer Reviewed
• Volume: 8
• Issue: 1
• Article Number: 19
• DOI: https://doi.org/10.1038/s41535-023-00554-x
• Keywords: Condensed Matter Physics; Electronic, Optical and Magnetic Materials
• Public URL: https://nottingham-repository.worktribe.com/output/20287999
• Publisher URL: https://www.nature.com/articles/s41535-023-00554-x