Regensburg 2025 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 11: Electronic Structure of Surfaces: Spectroscopy, Surface States I
O 11.3: Talk
Monday, March 17, 2025, 15:30–15:45, H4
Double Photoemission Spectroscopy of C60 on SrTiO3 (001) with high efficiency high-order harmonic light source — •Kathrin Plass1, Robin Kamrla1, Frank O. Schumann2, and Wolf Widdra1 — 1Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, Halle (Saale), Germany — 2Max Planck Institute of Microstructure Physics, Halle (Saale), Germany
The photoemission spectroscopy is one of the main tools for studying the electronic structure of solids. However, the effects of electron correlation can only be inferred indirectly. In contrast, double photoemission spectroscopy (DPE) enables the direct observation of such phenomena by detecting pairs of correlated photoelectrons ejected following the absorption of a single photon [1].
C60 is considered a strongly correlated material, exhibiting a highly structured valence band spectrum. Recently, we discovered orbital-resolved correlation-induced two-electron binding energy shifts in C60. In this study, we analyzed DPE data from C60 thin films on SrTiO3(001) obtained using a laboratory-based high-order harmonic generation (HHG) light source operating at MHz repetition rates [2]. By boosting the HHG light source to higher photon energies and repetition rates, we are now able to investigate plasmon-assisted double photoemission in C60, predicted recently [3].
[1] J. Berakdar et al., Phys. Rev. Lett. 81, 3535 (1998)
[2] C.-T. Chiang et al., ELSPEC 200, 15 (2015)
[3] M. Schüler et al., Sci. Rep. 6, 24396 (2016)
Keywords: C60; correlation; spectroscopy; photoemission; high harmonic generation