Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 119: Non-Equilibrium Daynamics in Light-Driven Materials: Theory Meets Experiment
O 119.5: Talk
Friday, March 16, 2018, 12:30–12:45, MA 141
Light-induced femtosecond dynamics in C60-films — •Razvan Krause, Mariana Chavez-Cervantes, Sven Aeschlimann, Andrea Cavalleri, and Isabella Gierz — Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, Hamburg, Germany
Motivated by the recent discovery of a light-induced superconducting-like state in K3C60 fullerides far above the critical temperature of 20 K [1] we are trying to unveil the underlying mechanism with time- and angle-resolved photoemission spectroscopy (tr-ARPES). We started by photo-exciting carriers across the HOMO-LUMO gap in C60 films grown on Si(111) with a resonant 1.5 eV femtosecond laser pulse, revealing an excited state life time of 50 fs. We are now exploring the possibility of driving large structural distortions of the C60 molecule through resonant excitation of the T1u phonon mode at 7µm wavelength, which has been proposed to be responsible for the light-induced superconducting-like state in K3C60 [1]. We present optical as well as tr-ARPES data that allow us to assess both the amplitude of the light-induced carbon displacements as well as the response of the electronic structure. We end by discussing the influence of doping and crystalline order for the light-induced C60 dynamics.
[1] Mitrano et al., Nature 530, 461 (2016)