Quantum 2025 – scientific programme
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MON: Monday Contributed Sessions
MON 12: Quantum Magnets
MON 12.4: Talk
Monday, September 8, 2025, 15:00–15:15, ZHG105
Thermoelectric response in Altermagnets — •Javad Vahedi1, Martin Gärttner1, and Ali Moghaddam2 — 1Institute of Condensed Matter Theory and Optics, Friedrich-Schiller-University Jena, Max-Wien-Platz 1, 07743 Jena, Germany — 2Computational Physics Laboratory, Physics Unit, Faculty of Engineering and Natural Sciences, Tampere University, FI-33014 Tampere, Finland
We study the thermoelectric properties of altermagnets using semiclassical Boltzmann transport theory with constant relaxation time. Altermagnets, with zero net magnetization but spin-split bands from staggered magnetic order, enable exploration of unconventional transport. Using a 2D tight-binding model with spin-independent hopping, altermagnetic exchange, and spin-orbit coupling, we analyze both Drude and Berry curvature contributions. Without a magnetic field, longitudinal conductivities σxx and αxx vary strongly with spin-orbit coupling λ and exchange J, peaking at intermediate λ. Symmetry-induced Berry curvature cancellation suppresses transverse responses σxy and αxy. A weak out-of-plane magnetic field breaks these symmetries, inducing notable transverse transport tied to band topology. Finite doping leads to complex Berry curvature patterns and sharp peaks in the anomalous Nernst signal αxy, reflecting resonant entropy transport. The transport behavior as a function of µ, λ, and J highlights the interplay between spin-orbit coupling, magnetic order, and topology. Our findings position altermagnets as tunable platforms for topological and spintronic applications.
Keywords: Thermoelectric; Linear response; Altermagnets