Guest Lecture: Prof. Dr. Ludger Wirtz

The Collaborative Research Center (CRC) 1415 welcomes Prof. Dr. Ludger Wirtz from the University of Luxembourg as a guest at Technische Universität Dresden. Prof. Wirtz works in the field of theoretical solid-state physics and, in his scientific lecture “Symmetries of Excitons & its Consequences in Optical Spectroscopy”, he presented a new symmetry-based approach to describing excitons. This approach goes beyond the traditional hydrogen-like model and fully incorporates the space-group symmetry of the crystal—an essential aspect, particularly for strongly bound excitons in two-dimensional materials (2DM).

Prof. Wirtz introduces the concept of crystalline angular momentum to explain exciton behavior, selection rules, and chirality. Using three exemplary systems, he illustrates how exciton symmetries determine optical absorption, resonant Raman scattering, and phonon-assisted photoluminescence.

We sincerely thank Prof. Dr. Ludger Wirtz for his visit to Technische Universität Dresden and for the valuable scientific exchange!