Layered Topological Antiferromagnetic Metal at Room Temperature -- YbMnGe
arXiv:2503.07206 · doi:10.1103/34g5-q2g6
Abstract
Metallic antiferromagnets are essential for efficient spintronic applications due to their fast switching and high mobility, yet room-temperature metallic antiferromagnets are rare. Here, we investigate YbMnGe, a room temperature antiferromagnet, and establish it as an exfoliable layered metal with altermagnetic surface states. Using multi-orbital Hubbard model calculations, we reveal that its robust metallic AFM ordering is stabilized by electronic correlations and a partially nested Fermi surface. Furthermore, we show that YbMnGe hosts symmetry-protected topological Dirac crossings, connecting unique even-order spin-polarized surface states with parabolic and inverted Mexican-hat-like dispersion. Our findings position YbMnGe as a promising platform for exploring the interplay of correlation, topology, and surface altermagnetism of layered antiferromagnets.
arXiv comment11 pages and 4 figures; To appear in Phys. Rev. B
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