Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 2: Altermagnets I
MA 2.7: Vortrag
Montag, 9. März 2026, 11:15–11:30, HSZ/0004
Emergent Altermagnetism in Antiferromagnetic Surfaces — •Colin Lange1, Rodrigo Jaeschke Ubiergo1, Alexander Mook2, and Jairo Sinova1 — 1Institut für Physik, Johannes Gutenberg Universität Mainz, Germany — 2Institut für Festkörpertheorie, Universität Münster, Germany
Three-dimensional altermagnets with collinear compensated order and non-relativistic spin splitting have recently been realized, but experimental access to their 2D counterparts remains limited. We show that surfaces of the most abundant class of collinear magnets -- conventional 3D antiferromagnets -- provide a general route to 2D altermagnetism through surface-induced symmetry breaking. We implement this in a semi-infinite stack geometry, effectively modeling a thin film to establish a direct connection to experimental systems. This way, the symmetry analysis made here has direct implications for readily available experiments and materials. Using our novel definition of "surface spin groups", which lies between the 3D and 2D cases due to the semi-infinite geometry, we provide a full symmetry classification of all possible cases of altermagnetic surface termination. We scan available databases of magnetic materials, and conclude that almost half of the collinear antiferromagnets can host an altermagnetic surfaces. We present calculations of spin-split surface states in realistic candidates, that can serve for future experimental verification of surface induced altermagnetism. Our work positions the broadly accessible landscape of antiferromagnets as a promising foundation for 2D altermagnetism, whose experimental realization remains limited.
Keywords: 2D Altermagnets; Symmetry Breaking; Surface states; Antiferromagnets