Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 62: Posters: Surface Reactions and Dynamics, Nanostructures

O 62.11: Poster

Mittwoch, 2. April 2014, 17:30–21:00, P1

Attosecond time resolved photoemission on solid surfaces — •Sergej Neb, Fabian Merschjohann, Peter Bartz, Matthias Hensen, Christian Strüber, Norbert Müller, Walter Pfeiffer, and Ulrich Heinzmann — Universität Bielefeld, Universitätsstr. 25, 33615 Bielefeld

The availability of single attosecond (as) XUV pulses allows investigating ultrafast electron dynamics on the as time scale. For a (110) tungsten surface Cavalieri et al. reported that the photoemission from tungsten 4f states is delayed by about 100 as with respect to the electron emission from the valence band [1]. The physical origin of this delay is not yet understood and controversial theoretical models coexist. Further as-time-resolved photoemission studies using other surfaces help to resolve this controversy.
Here we report on as-time-resolved photoemission from a van-der-Waals crystal that exhibits a completely different electronic structure. XUV pulses with about 300 as duration are generated by high harmonic generation in a Ne target using 5 fs IR laser pulses with stable carrier-envelope phase. The layered structure of the investigated solid yields element specific photoelectrons emitted from different depth and thus helps resolving the physical origin of temporal delays in photoemission.

A.L.Cavalieri et al., Nature 449, 1029 (2007)