Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 75: Ultrafast Electron and Spin Dynamics
O 75.13: Vortrag
Mittwoch, 22. März 2017, 18:00–18:15, TRE Phy
Femtosecond electron dynamics in the momentum space — •Florian Haag1, Johannes Seidel1, Tobias Eul1, Norman Haag1, Mirko Cinchetti2, Martin Aeschlimann1 und Benjamin Stadtmüller1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany — 2Experimentelle Physik VI, Technische Universität Dortmund, 44221 Dortmund, Germany
Excited electrons play a crucial role for many fundamental chemical and physical phenomena occurring at surfaces, (hybrid) interfaces, or in bulk materials. New insight into this field can be obtained by the combination of time-resolved two-photon photoemission spectroscopy with momentum microscopy. This novel approach of time-resolved 2 photon momentum microscopy offers the possibilities to follow the electron dynamics in the accessible momentum space and hence to determine momentum resolved lifetimes of excited electrons.
As most fundamental examples, we have studied the momentum resolved electronic lifetime of polycrystalline and single crystalline metal crystals. Using various combinations of light polarization for the pump and probe pulse allows us to distinguish the electron dynamics of bulk and surface bands. Our results will significantly contribute to a better understanding of momentum space dynamics of excited electrons and of inelastic und quasi-elastic scattering phenomena at interfaces and in solids.