Speaker
Description
Many-body perturbation theory allows us to describe on the same footing the interplay between competing interactions of similar strength and on the same energy scale, which can give rise to exciting phenomena. In this talk, I will highlight the role of electron-electron interaction, electron-vibrational coupling, and electron-hole correlation to understand electronic excitations in different material classes. I will also discuss the need for the development of advanced methodologies to keep up with the rapid progress in experimental techniques like angle-resolved photoemission experiments. Recent examples [1-3] will comprise 2D materials as well as their interfaces with organic semiconductors.
[1] I. Gonzalez Oliva, S. Tillack, F. Caruso, P. Pavone, and C. Draxl
Impact of electron-phonon interaction on the electronic structure of interfaces between organic molecules and a MoS$_2$ monolayer
J. Chem. Phys. 164, 074704 (2026).
[2] W. Bennecke, I. Gonzalez Oliva, J. P. Bange, P. Werner, D. Schmitt, M. Merboldt, A. M. Seiler, K. Watanabe, T. Taniguchi, D. Steil, R. T. Weitz, P. Puschnig, C. Draxl, G. S. M. Jansen, M. Reutzel, and S. Mathias
Hybrid Frenkel-Wannier excitons facilitate ultrafast energy transfer at a 2D-organic interface
Nat. Phys. 21, 1973 (2025).
[3] M. Schebek, I. Gonzalez Oliva, and C. Draxl
Efficient GW and BSE calculations of heterostructures within an all-electron framework
Phys. Rev. B 112, 165130 (2025).