SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: Poster Magnetism II

MA 40.11: Poster

Donnerstag, 30. März 2023, 14:00–16:00, P2/EG

Consequences of Orbital Angular Momentum of Light for Electronic Dynamics — •Marvin Goronczy and Hans Christian Schneider — Physics Department, RPTU Kaiserslautern, 67653 Kaiserslautern

Recent experiments show that the orbital angular momentum (OAM) of laser pulses affects the demagnetization dynamics in ferromagnets by slowing it down or speeding it up depending on the direction of the orbital angular momentum. [1] Motivated by these experiments, we consider here the basic problem of the interaction of OAM-light with electrons in a generic band structure in order to study the effect of OAM-light on the electronic system, without attempting to includemagnetization dynamics yet. We derive the dynamical equations for the reduced electronic density matrix and its Wigner transform. We discuss the role played by different contributions, such as multipole transitions and the inhomogeneities introduced by the beam profile. Finally, we compare our results with earlier approaches to this problem.[2]

[1] E. Prinz, B. Stadtmüller, M. Aeschlimann, arXiv.2206.07502 [2] G. F. Quinteiro, P. I. Tamborenea, EPL 85/47001