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MA: Fachverband Magnetismus

MA 38: Ultrafast Magnetization Effects II

MA 38.12: Vortrag

Mittwoch, 11. März 2026, 18:00–18:15, POT/0361

Impact of Structural Imperfections on the Ultrafast Orbital Hall Effect in Metallic Nanoribbons — •Theresa Albrecht, Franziska Ziolkowski, Börge Göbel, Ingrid Mertig, Jürgen Henk, and Samir Lounis — Institut für Physik, Martin-Luther-Universität, D-06099 Halle

The ultrafast orbital Hall effect (UOHE) arises when a femtosecond laser pulse drives a transient orbital current. We investigate how structural defects affect the UOHE in a Cu nanoribbon [1]. Using Evolve, a real-space tight-binding framework for finite systems [2], we simulate the laser-induced electron dynamics and compute the orbital angular momentum (OAM) and its associated currents with atomic resolution. Defects significantly alter the OAM landscape: while defect-free ribbons exhibit pronounced edge accumulation, imperfections redistribute OAM toward defect sites and progressively suppress edge signatures as their number increases. Furthermore, we analyze the phase relation between the p- and d-orbital contributions to the OAM in interface geometries. Our results reveal the pivotal influence of defects on ultrafast orbital transport and dynamics.

[1] O. Busch et al., Physical Review Research 6, 013208 (2024)

[2] F. Töpler et al., New Journal of Physics 23, 033042 (2021)

Keywords: Orbital Hall effect; Ultrafast electron dynamics; Laser excitation