SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Poster: Ultrafast Electron Dynamics at Surface and Interfaces II
O 37.10: Poster
Dienstag, 28. März 2023, 18:00–20:00, P2/EG
Transferring photonic orbital angular momentum to metals — •Jannis Leßmeister1, Tobias Eul1, Eva Prinz1, Sebastian Hedwig1, Martin Aeschlimann1, and Benjamin Stadtmüller1,2 — 1Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Germany — 2Institute of Physics, Johannes Gutenberg University Mainz, Germany
Optical fields can carry an orbital angular momentum (OAM) in helical beams with an azimuthal phase dependence. Since the discovery of this phenomenon in 1992 [1], the interaction of photonic OAM with matter has become a steadily growing field of research. After an initial focus on atoms and molecules, in the last years, scientists also began investigating solids [2]. For example, recent studies revealed that the so-called twisted light can drive photocurrents [3] and affects ultrafast demagnetization dynamics [4].
In our research, we apply time- and angle-resolved photoelectron spectroscopy (TR-ARPES) to gain new insight into the influence of photonic OAM on the hot carrier dynamics in metals. Specifically, we investigated the influence of the added orbital angular momentum on the optical excitation efficency of photoelectrons from the spin-split band structure of Rashba surface states and the hot carrier dynamics of spin-dependent carriers in the ferromagnet Ni.
[1] Allen et al., Phys. Rev. A 45 (1992)
[2] Quinteiro Rosen et al., Rev. Mod. Phys 94 (2022)
[3] Ji et al., Science 368 (2020)
[4] Prinz et al., arXiv:2206.070502 (2022)