Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 96: Ultrafast Electron Dynamics at Surfaces and Interfaces
O 96.5: Vortrag
Freitag, 20. März 2015, 11:45–12:00, MA 004
Attosecond delays in the photoemission from layered materials — Sergej Neb1, Fabian Siek1, Matthias Hensen1, Sebastian Fiechter2, Hugo Dil3, Norbert Müller1, •Walter Pfeiffer1, and Ulrich Heinzmann1 — 1Fakultät für Physik, Universität Bielefeld, Universitätsstr. 25, 33615 Bielefeld, Germany — 2Helmholtz Zentrum Berlin, Institut für Solare Brennstoffe, Hahn-Meitner-Platz 1, 14109 Berlin, Germany — 3Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
The availability of single attosecond (as) XUV pulses allows investigating ultrafast electron dynamics on the as time scale by recording slight temporal shifts of the photoelectron streaking in a simultaneously present strong IR field. The physical origin of the observed small delays is not yet understood and controversial theoretical models coexist demonstrating our still limited understanding of the fundamentals of the photoemission process. We report delays for core level emissions from different layered materials with and without inversion symmetry. This provides a larger data base for testing the various theoretical models. In particular solids with defined layers of different chemical composition allow an investigation of the influence of propagation effects and of photoelectron wave phase shifts.