Franziska Ziolkowski

Feb 26, 2024 | link.aps.org | Oliver Busch |Institut für Physik |Martin Luther Halle-Wittenberg |Franziska Ziolkowski

The orbital Hall effect can generate currents of angular momentum more efficiently than the spin Hall effect in most metals. However, so far, it has only been understood as a steady-state phenomenon. In this theoretical study, the orbital Hall effect is extended into the time domain. We investigate the orbital angular momenta and their currents induced by a femtosecond laser pulse in a Cu nanoribbon.

Nov 2, 2023 | link.aps.org | Oliver Busch |Institut für Physik |Martin Luther Halle-Wittenberg |Franziska Ziolkowski

Laser radiation incident on a ferromagnetic sample produces excited electrons and currents whose spin polarization must not be aligned with the magnetization—an effect due to spin-orbit coupling that is ubiquitous in spin- and angle-resolved photoemission. In this paper, we report on a systematic investigation of the dynamics of spin polarization and spin-polarized currents produced by femtosecond laser pulses, modeled within our theoretical framework evolve.

Sep 8, 2023 | link.aps.org | Oliver Busch |Institut für Physik |Martin Luther Halle-Wittenberg |Franziska Ziolkowski

The orbital angular momenta (OAM) of electrons play an increasingly important role in ultrafast electron and magnetization dynamics. In this theoretical study, we investigate the electron dynamics induced by femtosecond laser pulses in a normal metal, a ferromagnet, and a ferromagnet/normal metal heterostructure. We analyze the spatiotemporal distributions of the laser-induced OAM and their respective currents.