Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 79: Poster: Ultrafast Electron and Spin Dynamics at Interfaces

O 79.4: Poster

Wednesday, March 14, 2018, 18:15–20:30, Poster A

Time-resolved momentum microscopy using a high-repetition rate HHG lightsource — •David Schmitt, Marius Keunecke, Christina Nolte, Daniel Steil, Sabine Steil, and Stefan Mathias — I. Physikalisches Institut Göttingen, 37077 Göttingen, Friedrich-Hund-Platz 1

Recent developments in laser technology and electron spectrometers allow for the build-up of a new generation of time-resolved photoelectron emission experiments. With regard to lightsource development, coherent extreme-ultraviolet femtosecond pulses can today routinely be produced via high-harmonic generation at repetition rates up to 1 MHz, which is essential in time-resolved photoemission spectroscopy/microscopy to avoid space charge effects. In addition, new and highly-efficient electron spectrometers are available that map the full parallel momentum space of the electronic structure (ARPES), or can be used as photoemission electron microscopes (PEEM) with several tenths of nanometers spatial resolution. On our poster, we will present first measurements with such a combined time-resolved photoemission setup. We will discuss detection efficiency, space charge effects and energy-, time-, momentum- and spatial resolution that can be achieved.