Quantum 2025 – wissenschaftliches Programm

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MON: Monday Contributed Sessions

MON 12: Quantum Magnets

MON 12.4: Vortrag

Montag, 8. September 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 σ_xx and α_xx vary strongly with spin-orbit coupling λ and exchange J, peaking at intermediate λ. Symmetry-induced Berry curvature cancellation suppresses transverse responses σ_xy and α_xy. 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 α_xy, 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