Workshop on Ultrafast Dynamics in Strongly Correlated Systems

TR-ARPES by High Harmonic light pulses for the study of ultrafast dynamics in correlated materials

4 Apr 2011, 16:30

2h 30m

ETH Zurich, Campus Science City, HIT Building

Poster Poster session

Speaker

Timm Rohwer (Christian-Albrechts-Universität zu Kiel)

Description

Angle resolved photoelectron spectroscopy (ARPES) has proved to be a leading technique in identifying static key properties of complex electron systems. In a pump-probe scheme using femtosecond light pulses this application can be extended to monitor ultrafast changes in the electronic valence structure in response to an intense optical excitation, i.e. photo-induced phase-transitions of correlated systems [Talk Rossnagel]. Here we present an experimental setup for time-resolved ARPES using femtosecond XUV probe pulses. We will focus on the relevant details and specifications of our system such as time and energy resolution, XUV photon flux and harmonic selection by a multilayer mirror monochromator. The capabilities of the setup will be exemplified by selected data that we obtained when studying phase transition dynamics in 1T-TiSe2. We particular show that the application of XUV pulses is highly advantageous in recording photoemission transients covering the full size of the Brillouin zone.