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MA: Fachverband Magnetismus
MA 43: Magnetic Semiconductors, Magnetization Dynamics and Damping
MA 43.1: Vortrag
Donnerstag, 21. März 2024, 15:00–15:15, EB 202
Low-energy properties of electrons and holes in CuFeS2 — •Bjørnulf Brekke1, Roman Malyshev2, Ingeborg-Helene Svenum3,4, Sverre M. Selbach5, Thomas Tybell2, Christoph Brüne1, and Arne Brataas1 — 1Center for Quantum Spintronics, Department of Physics, NTNU Norwegian University of Science and Technology, Trondheim, Norway — 2Department of Electronic Systems, NTNU Norwegian University of Science and Technology, Trondheim, Norway — 3Department of Chemical Engineering, NTNU Norwegian University of Science and Technology, Trondheim, Norway — 4SINTEF Industry, Trondheim, Norway — 5Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, Trondheim, Norway
The antiferromagnetic semiconductor CuFeS2 belongs to a magnetic symmetry class that is of interest for spintronics applications. In addition, its crystal lattice is compatible with Si, making it possible to integrate it with nonmagnetic semiconducting structures. Therefore, we investigate this material by finding the effective k*p Hamiltonian for the electron and hole bands. We base this description on ab initio calculations and classify the electronic bands by their symmetry. As a result, we find that CuFeS2 exhibits spin-polarized bands. We also find that the crystal symmetry allows for the anomalous Hall effect. Finally, we suggest using cyclotron resonance to verify our proposed effective mass tensors at the conduction band minimum and valence band maximum.
Keywords: Antiferromagnet; Ab-initio calculations; Electron properties; Altermagnet