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O: Fachverband Oberflächenphysik
O 44: Ultrafast Electron Dynamics II (joint session O/MA)
O 44.9: Vortrag
Dienstag, 17. März 2020, 13:00–13:15, WIL B321
Ultrafast excited state dynamics and transient band structure renormalizations in endohedral metallofullerenes — •Sebastian Hedwig, Sebastian Emmerich, Benito Arnoldi, Johannes Stöckl, Benjamin Stadtmüller, and Martin Aeschlimann — Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Straße 46, 67663 Kaiserslautern, Germany
Fullerenes have been object to intense research in the past decades, with promising potential for their implementation in optoelectronic devices. Embedding metal atoms or clusters into the fullerene by chemical synthesis can alter the cage symmetry, which strongly influences the molecular transport properties as well as the available relaxation channels of excited electronic states. Of special interest in this field is the cluster-cage electron transfer. Here, we present a time resolved photoemission study carried out on thin films of the prototypical endohedral metallofullerene Sc3N@C80 in a fs UV-pump XUV-probe experiment. We observe a transient broadening of all (polaronic) molecular valence states which follows the timescale of the exciton formation and decay in the molecular films, in analogy to our recent findings for the fullerene C60 [1]. Moreover, we show that the exciton and polaron dynamics are strongly altered upon K intercalation of the pristine film. This enables us to draw conclusions regarding cluster-cage charge transfer on ultrafast timescales. [1] B. Stadtmüller et al., Nat Commun 10, 1470 (2019)