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MA: Fachverband Magnetismus
MA 33: Altermagnets IV
MA 33.12: Vortrag
Mittwoch, 11. März 2026, 18:00–18:15, HSZ/0002
Robust spin splitting and optical control in a layered altermagnet — •Alessandro De Vita1,2, Chiara Bigi3, Davide Romanin4, Ralph Ernstorfer1,2, Ilija Zeljkovic5, Younghun Hwang6, Matteo Calandra7, Jill A. Miwa8, and Federico Mazzola9 — 1Institut für Physik und Astronomie, Technische Universität Berlin — 2Fritz Haber Institut der Max Planck Gesellshaft — 3Synchrotron SOLEIL — 4Université Paris-Saclay, CNRS — 5Department of Physics, Boston College — 6Electricity and Electronics and Semiconductor Applications Ulsan College — 7Department of Physics, University of Trento — 8Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University — 9Dipartimento di Fisica e Astronomia Galileo Galilei, Padova
Altermagnetism defies conventional classifications of collinear magnetic phases, with its unique combination of spin-dependent symmetries, net-zero magnetization, and anomalous Hall transport. Although altermagnetic states have been realized experimentally, their integration into functional devices has been hindered by the structural rigidity and poor tunability of existing materials. First, through cobalt intercalation of the superconducting 2H-NbSe2 polymorph, we induce and stabilize a robust altermagnetic phase and, via angle- and spin-resolved photoemission spectroscopy (spin-ARPES), we directly observe the lifting of Kramers degeneracy. Then, using ultrafast laser pulses, we demonstrate how a low-temperature phase can be quenched. Our findings open pathways to spin-based technologies and lay a foundation for advancing the emerging field of altertronics.
Keywords: Layered TMD; ARPES; Altermagnetism