SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 85: Electronic Structure of Surfaces II
O 85.5: Talk
Thursday, March 30, 2023, 16:00–16:15, REC C 213
Double Photoemission Spectroscopy of C60 on SrTiO3(001) with Laser VUV radiation — •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
Via photoelectron spectroscopy, important insights into the electronic structure of solids were obtained. However, correlation effects can only be addressed indirectly. With double photoemission spectroscopy (DPE), such phenomena can be observed directly by detecting pairs of correlated photoelectrons emitted upon absorption of a single photon [1]. C60 is classified as a strongly correlated material with a highly structured valence band spectrum. Moreover, theory predicts the possibility of plasmon-mediated pair emission in C60 [2]. In this contribution we present DPE data for C60 thin films on SrTiO3(001), obtained by a laboratory high-order harmonic (HHG) light source, operating at an energy range from 14 to 40 eV and MHz repetition rates [3]. We analyze the 2D energy maps and compare the data to the SPE spectrum. In addition, we discuss plasmon-mediated DPE in fullerenes.
[1] J. Berakdar et al., Phys. Rev. Lett. 81, 3535 (1998)
[2] Y. Pavlyukh et al., Phys. Rev. B 91, 155116 (2015)
[3] A. Trützschler et al., Phys. Rev. Lett. 118, 136401 (2017)