Excitation Transfer in Atomically Thin Materials

Atomically thin semiconductors and hybrid structures constitute a remarkable playground for exciton physics in two dimensions. This involves optically accessible (bright) as well as spin- and momentum-forbidden (dark) excitonic states including intravalley and intervalley excitations. The nonlinear, coherent and incoherent exciton dynamics induced by light pulses results from the interplay of intrinsic exciton-exciton and exciton-phonon interactions. Here, we present applications of the theory to:<br/>-biexcitons and exciton-exciton scattering induced coherence decay,<br/>-detection of exciton wave function dynamics in time resolved ARPES, and<br/>-different charge-, Dexter- or Förster-type transfer processes in atomically thin semiconductors functionalized with organic molecules, graphene or metal nanoparticles.<br/>A comparison to experiments is provided throughout the talk.<br/>This work is done in coilaboration with Malte Selig, Florian Katsch, Dominik Christiansen, Manuel Katzer, Lara Greten, Robert Salzwedel and Henry Mittenzwey (TU Berlin).