Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 74: Ultrafast Electron and Spin Dynamics at Interfaces
O 74.6: Poster
Mittwoch, 9. März 2016, 18:15–20:30, Poster A
A setup for time-resolved SHG microscopy of 2D heterostructures — •Jonas Zimmermann, Gerson Mette, and Ulrich Höfer — Philipps-Universität Marburg, Renthof 5, 35032 Marburg, Germany
Van-der-Waals coupled 2D materials span the whole range from metallic over semiconducting up to isolating materials and their combination leads to fascinating opportunities for designing stacked heterostructures. The huge variety of possibilities calls for experimental methods which can effectively probe the structure as well as the electron dynamics of these heterostructures.
Here, we present an experimental setup for time-resolved studies on interfaces of 2D heterostructures by means of SHG microscopy. This technique allows us to quantify the crystal structure via polarization dependent measurements and will give access to the electron dynamics via time-resolved pump-probe measurements. We demonstrate the capabilities of our setup with measurements done on CVD grown polycrystalline WS2 monolayer flakes. The resolution of the experiment is diffraction limited to about 2µm. The relative orientation of several crystal domains can be determined with an error of a few degrees. Because the setup is designed to exclude any dispersion afflicted components, high temporal resolution by the use of ultra-short laser pulses in a pump-probe measurement is feasible. This combination of high temporal and spatial resolution can be applied to 2D heterostructures to study the effects of relative crystal orientation on time-dependent charge transfer processes between different materials.