Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 94: Ultrafast Surface Dynamics II

O 94.3: Talk

Friday, March 11, 2016, 11:15–11:30, S054

Femtosecond electron dynamics: Accessing the momentum space — •Norman Haag, Johannes Seidel, Lisa Grad, Benjamin Stadtmüller, Mirko Cinchetti, and Martin Aeschlimann — Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany

Time resolved two-photon photoemission spectroscopy has proven to be a powerful tool to investigate electron dynamics at surfaces on a femtosecond timescale [1]. Combining this method with momentum microscopy [2], a novel tool for angle resolved photoemission, offers the possibility to follow electron dynamics throughout the entire accessible momentum space.
As a prototype system, we have studied the pristine Ag(111) surface as well as a monolayer of Pb grown on Ag(111) with time resolved momentum microscopy. We have chosen these systems as they exhibit either surface states or quantum well states. The significantly different wave function overlap of these states with bulk states of the silver substrate will yield different relaxation dynamics of excited electrons. Analyzing different regions in momentum-space for constant intermediate state energy provides a detailed view of the momentum space dynamics of optically excited electrons.

References
M. Bauer et al., Prog. in Surf. Sc. 90, 319 (2015)
C. Tusche et al., Ultramicroscopy (2015)