Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 54: Altermagnets VI
MA 54.8: Talk
Friday, March 13, 2026, 11:30–11:45, HSZ/0002
Ultrafast carrier dynamics in the g-wave altermagnet CoNb4Se8 — •Alexander Schmid1, Gregor Zinke1,2, Resham B. Regmi3, Luca Haag2, Tobias Eul1, Hans C. Schneider2, Nirmal J. Ghimire3, Martin Aeschlimann2, and Benjamin Stadtmüller1 — 1University of Augsburg — 2RPTU University Kaiserslautern-Landau — 3University of Notre Dame, USA
Altermagnets have sparked considerable interest as a new type of compensated magnet with an unconventional spin splitting in momentum space that is rooted in the crystal and spin group symmetries of these materials.
In the manifold of altermagnetic candidates, intercalated transition metal dichalcogenides such as CoNb4Se8 have been identified as altermagnetic materials with characteristic g-wave spin splitting below 168 K. [1]
In our work, we used time- and momentum-resolved photoemission to gain insight into the ultrafast dynamics of the layered altermagnetic CoNb4Se8. Specifically, we focus on the ultrafast carrier dynamics near the characteristic spin-split bands at the M-point of the band structure, both in the altermagnetic and paramagnetic phases. This direct comparison allows us to uncover the impact of the spin and nodal plane structure of altermagnets on the ultrafast charge and spin carrier scattering. Our findings will be a vital first step toward understanding the optical response of altermagnets on ultrafast timescales.
[1] R. B. Regmi et al., Nat. Commun. 16, 4399 (2025)
Keywords: Ultrafast carrier dynamics; Pump Probe; Angle resolved photoemission spectroscopy; CoNb4Se8