Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 12: Ultrafast Electron and spin dynamics at interfaces II
O 12.10: Vortrag
Montag, 12. März 2018, 17:45–18:00, MA 005
Breakdown of the atto-clock concept in attosecond-time-resolved photoemission from solids — •Andreas Gebauer1,2, Sergej Neb1, Walter Enns1, Ulrich Heinzmann1, Andrey K. Kazansky3,4,5, and Walter Pfeiffer1 — 1Molecular and Surface Physics, University of Bielefeld, Germany — 2Ultrafast Phenomena At Surfaces, TU Kaiserslautern, Germany — 3University of the Basque Country, 20080, San Sebastián, Spain — 4Donostia International Physics Center (DIPC), 20018 San Sebastián, Spain — 5IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
The availability of single attosecond EUV pulses paved the way to observe electrons at solid surfaces on their natural time scale [1]. In streaking spectroscopy the interaction of a photoelectron with an intense NIR streaking field reveals relative delays of different emission channels with up to 10 as resolution [2].
Here, the impact of an inhomogeneous and penetrating IR field distribution on as-time-resolved photoemission from solid surfaces is simulated based on solving the one-dimensional TDSE [2].
It is shown that the penetration of the IR fields has an substantial impact on the relative delays. Therefore, the phenomenological concept of a classical atto-clock, that can be envisioned as a common finish line for different photoemission channels, needs to be discussed.
[1] A.L. Cavalieri, et al., Nature 449, 1029 (2007).
[2] F. Siek, et al., Science 357, 1274 (2017)