Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 42: Posters Magnetism I
MA 42.25: Poster
Wednesday, March 18, 2020, 15:00–18:00, P3
Electron scattering dynamics with anisotropic excitation — •Marius Weber, Kai Leckron, and Hans Christian Schneider — University of Kaiserslautern, Kaiserslautern, Germany
Ultrafast electron scattering plays an important role in different systems with itinerant carriers such as optically excited ferromagnets or transition metal dichalcogenides. While momentum-dependent electron scattering has been studied extensively in optically excited semiconductors [1,2], these studies were confined to isotropic parabolic model band structures. Here, we calculate electronic dynamics at the level of Boltzmann scattering integrals with and without non-Markovian effects, which lead to a broadening of the energy conservation condition following the approach of Ref. [1]. We study how broadening effects influence the dynamics, in particular the behavior of the kinetic energy. In order to treat electronic dynamics in metallic systems, we have developed a numerical solution for the dynamical distribution function depending on the momentum vector that is applicable to more realistic band structures. Our approach leads to well-converged dynamics and is capable of treating up to 303 k-points in the three-dimensional Brillouin zone. In a first step we investigated the behavior of anisotropic excitation conditions in a single band.
[1] Bonitz et al., Journal of Physics: Condensed Matter. 8(33):6057 (1999)
[2] Haug and Jauho, Quantum Kinetics in Transport and Optics of Semiconductors, Springer, Berlin Heidelberg (2008)