Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 85: Ultrafast Electron Dynamics at Surfaces and Interfaces II: New Methods and Developments
O 85.2: Vortrag
Donnerstag, 4. April 2019, 15:15–15:30, H16
Comparison of RABBITT and streaking delays in attosecond time-resolved photoemission at solid surfaces — •Andreas Gebauer1,2, Sergej Neb1,3, Walter Enns1, Benjamin Stadtmüller2, Martin Aeschlimann2, and Walter Pfeiffer1 — 1Bielefeld University, Germany — 2University of Kaiserslautern, Germany — 3ETH Zürich, Switzerland
The availability of single attosecond pulses and pulse trains paved the way to study electron dynamics at solid surfaces on their natural time scale [1] by applying either the attosecond streaking spectroscopy or RABBITT approach. Both techniques allow investigating time delays in the photoemission process from different initial states in the solid.
Here, we present a theoretical comparison between such delays that can be measured either by attosecond streaking or RABBITT, respectively. The time-resolved photoemission spectra are obtained by solving the 1D time-dependent Schrödinger equation using model potentials that were recently successfully applied to explain experimental data [2]. We show a continuous transition from the RABBITT regime to the streaking regime.
The absolute delays obtained by both methods are in agreement with each other within the available accuracy for kinetic energies >10eV. However, the evaluation of RABBITT spectra that are generated by a few-cycle infrared field is hindered by subtle systematic deviations between simulated results and commonly applied model functions.
[1] A.L. Cavalieri, et al. Nature 449, 1029 (2007)
[2] F. Siek, et al., Science 357, 1274 (2017)