Garchinger Maier-Leibnitz-Kolloquium: Topology Aspects, Electronic States and Their Spin Dynamics

by Prof. Claus M. Schneider (Peter Grünberg Institut PGI-6, Forschungszentrum Jülich)

Thursday 12 Jan 2023, 16:15 → 17:15 Europe/Berlin

Lecture Hall, ground floor (west) (LMU building, Campus Garching, Am Coulombwall 1)

Quantum materials often exhibit a competition of electron- and spin-dependent interactions, i.e spin-orbit coupling and exchange interaction. Moreover, also a symmetry breaking (inversion and/or time-reversal) may be at play causing topological properties. Close to the Fermi level, this situation leads to peculiar electronic dispersions, often also resulting in complex spin textures in momentum space and peculiar transport phenomena. In order to understand the physics of quantum materials on a fundamental level, we first need a detailed view of these electronic states, disentangling the role of the various interactions. Using photoelectron spectroscopies we notice even the static electronic structure of classical ferromagnets to reveal many aspects of a quantum material. In the second part of the presentation we turn to laser-driven time-resolved studies in an effort to also probe the ultrafast electron and spin dynamics in such systems. We find that the ultrafast demagnetization is a complex process. It involves a band mirroring approach in the electronic structure, and may involve superdiffusive spin currents modulating the magnetic order in complex layered systems.

Hybrid access via ZOOM:

https://tum-conf.zoom.us/j/8568028697
Meeting ID: 856 802 8697
Passcode:   786201

 

kolloquium-12-01-23.pdf