Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 47: Altermagnets V

MA 47.6: Vortrag

Donnerstag, 12. März 2026, 16:15–16:30, HSZ/0002

Atomic altermagnetism — •Rodrigo Jaeschke-Uiergo¹, Venkata K. Bharadwaj¹, Warlley Campos², Ricardo Zarzuela¹, Nikolaos Biniskos³, Rafael M. Fernandes⁴, Tomáś Jungwirt⁵, Jairo Sinova¹, and Libor Šmejkal^2,6,1,5 — ¹Johannes Gutenberg Universität, Mainz, Germany — ²Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — ³Charles University, Prague, Czech Republic — ⁴University of Illinois Urbana-Champaign, Urbana, USA — ⁵Czech Academy of Sciences, Prague, Czech Republic — ⁶Max Planck Institute for Chemical Physics of Solids, Dresden Germany

Altermagnetism has recently been verified experimentally in MnTe and CrSb, which feature two sublattices with antiparallel magnetic dipole moments. In this talk, I will introduce the concept of atomic altermagnetism, a form of ferroic higher-order partial waves of the atomic spin density. Using spin-symmetry analysis and a partial-wave decomposition of first-principles spin densities, we demonstrate such non-dipolar spin order in MnTe, CrSb and KV₂Se₂O, where it coexists with the Néel order. In the Mott insulator Ba₂CaOsO₆, we uncover a striking case of pure atomic altermagnetism, which is entirely absent of dipolar sublattice order. These results show that altermagnetism can occur without Néel order. Finally, I will show that KV₂Se₂O and Ba₂CaOsO₆ are predicted to host giant spin-splitter angles of up to 42^∘ and 26^∘, respectively demonstrating that strong altermagnetic responses can emerge without requiring the staggered Néel order of local dipole moments.

Keywords: altermagnetism; spin symmetries; spin currents; Lieb lattice; order parameter