Dresden 2020 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Session - Ultrafast Electron Dynamics at Surface and Interfaces
O 58.3: Poster
Dienstag, 17. März 2020, 18:15–20:00, P2/2OG
Femtosecond time-resolved momentum microscopy on Graphene — •David Schmitt1, Marius Keunecke1, Christina Möller1, Hendrik Nolte1, Wiebke Bennecke1, Davood Momeni Pakdehi2, Klaus Pierz2, Hans Werner Schumacher2, Matthijs Jansen1, Marcel Reutzel1, Daniel Steil1, Sabine Steil1, and Stefan Mathias1 — 1I. Physikalisches Institut, 37077 Göttingen, Germany — 2Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany
Recent experiments have shown that the photoexcitation of electrons in graphene leads to an ultrafast polarization-dependent anisotropy in the unoccupied Dirac cones[1]. To observe and analyze such anisotropies it is advantageous to employ a photoemission experiment that enables simultaneous access to all k-points with femtosecond resolution. We have built such a setup in recent years, which is based on time-of-flight momentum microscopy in combination with a 1 MHz femtosecond high-harmonic generation light source. The capabilities of the setup are evidenced by following the excitation and relaxation of the electronic structure in the whole Brillouin zone. In our poster, we will discuss our time-resolved experimental results regarding the hot electron dynamics in graphene.
[1] S. Aeschlimann et al., Phys. Rev. B 96, 020301 (2017)