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O: Fachverband Oberflächenphysik
O 23: Ultrafast Electron Dynamics at Surfaces and Interfaces III
O 23.5: Vortrag
Dienstag, 19. März 2024, 11:30–11:45, MA 041
Quantification of local electric fields in ultrafast photoemission experiments — •Marco Merboldt1, Michael Schüler2, David Schmitt1, Jan Philipp Bange1, Wiebke Bennecke1, David Ramcke1, Karun Gadge3, Salvatore R. Manmana3, Sabine Steil1, G. S. Matthijs Jansen1, Daniel Steil1, Michael Sentef4, Marcel Reutzel1, and Stefan Mathias1 — 1Georg-August-Universität Göttingen, I. Physikalisches Institut, Germany — 2Department of Physics, University of Fribourg, Fribourg, Switzerland — 3Georg-August-Universität Göttingen, Institut für Theoretische Physik, Germany — 4Institute for Theoretical Physics, University of Bremen, Bremen, Germany
The optical control of material properties using femtosecond laser pulses is one of the driving goals in ultrafast condensed matter physics. Optical parameters to control, e.g., far-from-equilibrium phases or hidden states, are the optical wavelength, the pulse duration and sequence, the polarization, and the electric field strength. For the latter, it is important to realize that the dielectric properties of the sample screen the incident light fields. Therefore, it is desirable to be able to determine the local field strength directly from the data of the time-resolved measurement.
Here, we show how to quantify the local electric field strength in trARPES experiments. We achieve this by analyzing the polarization- and momentum-resolved photoemission intensity originating from band replica generated via the laser-assisted photoelectric effect (LAPE).
Keywords: Ultrafast momentum microscopy; trARPES; Graphene; light-matter interaction