Extended s-wave altermagnets

ORAL

Abstract

We propose extended s-wave altermagnets (sAMs) as a class of magnetic states which are fully gapped, spin-compensated, and feature spin-polarized bands. sAMs are formed through valley-exchange symmetries, which act as momentum-space translations beyond standard crystallographic spin-group classifications. Using an effective two-valley model, we demonstrate that sAMs exhibit isotropic spin splitting, enable spin-selective transport in tailored heterostructures, and give rise to descendant pair density wave order. From a microscopic sAM minimal model, we develop the guiding principles to identify sAMs in quantum magnets.

*This work is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through Project-ID 258499086 (SFB 1170), through the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter (ct.qmat, Project-ID 390858490, EXC 2147), and through the Research Unit QUAST, Project-ID 449872909 (FOR5249).

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Publication: https://arxiv.org/abs/2508.20163

Presenters

  • Lennart Klebl

    • University of Hamburg
    • University of Würzburg

Authors

  • Lennart Klebl

    • University of Hamburg
    • University of Würzburg

  • Matteo Dürrnagel

    • University of Würzburg

  • Tobias Müller

    • University of Würzburg

  • Ronny Thomale

    • Julius-Maximilians University of Wuerzburg
    • University of Würzburg

  • Michael Klett

    • University of Würzburg