Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 20: Altermagnets III
MA 20.5: Talk
Tuesday, March 10, 2026, 15:00–15:15, HSZ/0002
Dynamical orbital pumping in altermagnets — •Guidobeth Sáez-Toro1, Mirco Sastges2, Myunil Choi3, Dongwook Go3, and Yuriy Mokrousov2 — 1Departamento de Física, Facultad de Ciencias, Universidad de Chile, Santiago 7800024, Chile — 2Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich, 52425 Jülich, Germany — 3Department of Physics, Korea University, Seoul 02841, Republic of Korea
Altermagnets constitute a recently recognized class of magnetic materials in which symmetry breaking between sublattices and orbital degrees of freedom gives rise to unconventional magnetic responses. A direct consequence of this symmetry structure is that time-dependent magnetization generates a purely orbital pumping mechanism, ∂t ⟨ L ⟩α = χαβL (m × ∂t m)β, mediated by spin-orbit coupling. We investigate this effect by driving the Néel order in a minimal tight-binding model on a square altermagnetic lattice, based on an antiferromagnetic array of spins with an orbital crystal field breaking both C4 rotational and sublattice exchange symmetries. Our results reveal a pronounced sublattice dependence of the orbital response, providing a clear microscopic distinction between antiferromagnetic and ferromagnetic configurations. Using the Bastin-Smrcka-Streda Kubo formula, we compute the full response tensor and show that orbital pumping naturally decomposes into two robust contributions, analogous to field-like and damping-like components. These findings establish orbital pumping as a distinctive dynamical signature of altermagnets and highlight its potential for next-generation orbitronic functionalities.
Keywords: Orbital pumping; Magnetization Dynamics; Altermagnets; Linear response; Condensed matter