Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 3: Ultrafast Electron and spin dynamics at interfaces I
O 3.7: Talk
Monday, March 12, 2018, 12:00–12:15, MA 005
Intra-atomic Delays in Attosecond Time-resolved Solid State Photoemission — Fabian Siek1, Sergej Neb1, Peter Bartz1, Matthias Hensen1, Christian Strüber1, Sebastian Fiechter2, Miquel Torrent-Sucarrat3,4,5, Vyacheslav M. Silkin3,4,5, Eugene E. Krasovskii3,4,5, Nikolay M. Kabachnik6,7, Stephan Fritzsche8, Ricardo Díez Muiño4,9, Pedro M. Echenique3,4,9, Andrey K. Kazansky3,4,5, Norbert Müller1, •Walter Pfeiffer1, and Ulrich Heinzmann1 — 1University of Bielefeld, Germany — 2Institut für Solare Brennstoffe, Germany — 3University of the Basque Country, Spain — 4Donostia International Physics Center, Spain — 5IKERBASQUE, Basque Foundation for Science, Spain — 6Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Russia — 7European XFEL GmbH, Germany — 8Helmholtz-Institut Jena, Germany — 9Centro de Física de Materiales, Spain
Attosecond time-resolved photoemission on the semiconductor WSe2 allows investigating temporal delays from different initial states with unprecedented resolution. The observed delays cannot be attributed to photoelectron propagation in the solid but intra-atomic corrections such as the formation of a centrifugal barrier must be taken into account to match the experimental results. This sheds new light on the fundamental mechanism involved in the photoemission process from solids on the very initial stage of photoelectron emission, i.e. for the very short time window the emitted electron still resides inside the atom from which it is emitted.