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MA: Fachverband Magnetismus

MA 9: Altermagnets I

MA 9.3: Vortrag

Montag, 17. März 2025, 15:30–15:45, H20

Local signatures of altermagnetic order — •Jannik Gondolf¹, Andreas Kreisel¹, Mercè Roig¹, Daniel F. Agterberg², and Brian M. Andersen¹ — ¹Niels Bohr Institute, University of Copenhagen, DK-2200 Copenhagen, Denmark — ²Department of Physics, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201, USA

Altermagnets are known to share properties of ferromagnets and antiferromagnets. They feature time-reversal symmetry breaking, non-relativistic anisotropic band splitting and compensated net magnetization. Fundamental properties of altermagnetism include the anomalous Hall effect, a spin-polarized band structure in angle-resolved photoemission spectroscopy and spin-polarized currents. We employ a minimal model to investigate the local signatures of altermagnetism in the vicinity of impurities using T-matrix theory and exact diagonalization. Our findings suggest that the altermagnetic symmetry breaking is directly imprinted in the local density of states. These signatures can be quantified by scanning tunnel microscopy, offering a new approach for identifying and characterizing potential altermagnetic materials experimentally. Further, we explore potential interplay between altermagnetism and superconductivity.

Keywords: altermagnetism; disorder; STM