Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 12: Terahertz Spintronics
MA 12.2: Vortrag
Montag, 9. März 2026, 15:15–15:30, POT/0351
Lightwave-driven spintronics by coherent breaking of time-reversal symmetry — •Philipp Weißenberger1, Josef Riepl1, Adrian Seith1, Michael Aschenbrenner1, Josef Freudenstein1, Omer Kneller1, Daniel Riese1, Manuel Meierhofer1, Konstantin Kokh2, Oleg Tereshchenko2, Jörg Wunderlich1, Ulrich Höfer1, Ferdinand Evers1, Jan Wilhelm1, and Rupert Huber1 — 1University of Regensburg, Germany — 2Novosibirsk, Russia
Lightwave electronics has the potential to revolutionize high-speed information technology by using the carrier field of light to steer electrons at optical clock rates. Yet, expanding this subcycle control scheme to the spin, one of the most important quantum attributes, has remained a challenge. Additionally, time-reversal symmetry (TRS) prohibits a net spin polarization in non-magnetic solids, limiting ultrafast spintronics to magnetic systems with intrinsically broken TRS. Here, we transcend these boundaries by leveraging intense, phase-stable terahertz (THz) pulses to accelerate Dirac fermions in the topological state of Bi2Te3. Due to spin-momentum locking, the THz field drives ballistic, spin-polarized currents. The nonequilibrium occupation coherently breaks TRS and leads to a net surface magnetization. Our all-optical measurements show that these dynamics follow the driving vector potential, proving their dissipationless nature and our magnetic switching abilities. Astonishingly, the data reveals an anisotropic coupling to higher-lying topological states. Our scheme could be transferred to a host of non-magnetic systems and boost ultrafast magnetic metrology.
Keywords: Lightwave electronics; Ultrafast photonics; Magneto-optics; Ultrafast spintronics; Semiconductor Bloch equations