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O: Fachverband Oberflächenphysik

O 62: Posters: Surface Reactions and Dynamics, Nanostructures

O 62.12: Poster

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

Time- and angle-resolved XUV ARPES at sub-15 fs temporal resolution — •Gerald Rohde, Arne Hendel, Lexian Yang, Ankatrin Stange, Kerstin Hanff, Christian Sohrt, Lutz Kipp, Kai Rossnagel, and Michael Bauer — Institut für Experimentelle und Angewandte Physik der Christian-Albrechts-Universität zu Kiel

Time- and angle-resolved photoelectron spectroscopy (trARPES) provides a most direct access to ultrafast electronic processes in condensed matter systems. Application of XUV photon pulses generated in High-Harmonic Generation (HHG) light sources allows probing transient electronic structure within the entire Brillouin zone and beyond [1]. Typically, it is the pump pulse that limits the time-resolution of such experiments to values of ≥ 30 fs so that extremely fast phenomena such as characteristic melting times of electronic phases [2] or the thermalization of a nascent electron distribution [3] may remain unresolved.

Here we present a HHG-based trARPES setup exhibiting a substantially improved time-resolution. The optical pump-line of the experiment is operated using sub-6 fs pulses at a center wavelength of about 800 nm as generated in an amplifier-driven hollow-fiber chirped-mirror compressor. In the contribution, details of the compressor optimization procedure and its integration into the existing trARPES setup are described. First trARPES measurements on 1T-TiSe₂ are shown providing direct experimental evidence for a sub-15 fs time-resolution.
[1] T. Rohwer et al., Nature 471, 490 (2011)
[2] S. Hellmann et al., Nature Communications 3, 1069 (2012)
[3] G. Rohde et al., Eur. Phys. J.-Spec. Top. 222, 997 (2013)