Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Poster III

MA 41.44: Poster

Donnerstag, 20. März 2025, 15:00–17:30, P3

Quasiparticle interference in an altermagnetic tight-binding model — •Eric Petermann, Kristian Maeland, and Björn Trauzettel — Institute for Theoretical Physics and Astrophysics, University of Würzburg, 97074 Würzburg, Germany

Altermagnets constitute novel magnetic systems characterized by compensated magnetic ordering and momentum-dependent spin splitting without net magnetization. We employ tight-binding models to analyze quasiparticle interference (QPI) patterns in altermagnetic lattices. In the presence of impurities, scattering processes give rise to spatial modulations of charge and spin densities emerging from the interference of quasiparticles. This interference results in QPI patterns near those impurities. We relate the QPI patterns with the type of altermagnetic order.

Keywords: altermagnet; Friedel oscillations; quasiparticle interference; tight-binding