Event announcement as pdf-Download (https://tu-dresden.de/mn/phys ik/ressourcen/dateien/physikalisches-kolloquium/2024-12-03-Phys_Kolloq-Dre sdner-Promotionspreis-Physik-2024-WiSe2024.pdf).
Dr. Benedi kt Placke: Fractons and Exotic Gauge Fields in a Simple Lattice Model: One of the central concepts in condensed matter physics is the idea that the low energy excitations of a system are weakly interacting partic lelike objects called quasiparticles. In general\, these quasipaticles are capable of independent motion\, allowing energy inserted locally into the system to spread out\, thus allowing equilibration. Fractons are quasipar ticles outside this paradigm\, being completely immobile when isolated and hence precipitating complex dynamics. Here\, we present a simple lattice model in two dimensions realising a magnetic ‘liquid’ of Fractons\, wi th mobility constraints arising as the consequence of an exotic emergent g auge theory.
Dr. Lukas Körber: Spin waves in curved magne tic shells: Modifications to the topology\, symmetry\, or\, more generally\, geometry induced by surface curvature can lead to various emer gent phenomena in condensed matter systems. For example\, in spin waves\, the low-energy excitations in ferromagnets can experience curvature-induce d chiral symmetry-breaking\, resulting in an asymmetric spin-wave dispersi on\, nonreciprocal mode hybridization\, or even entirely unidirectional pr opagation. Aided by developing a novel finite-element-based method\, publi shed in the open-source package TetraX and tailored to efficiently study s pin-wave spectra in various geometries\, this thesis explores multiple geo metrical aspects of spin-wave dynamics in curved magnetic shells.