Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 45: Ultrafast Electron Dynamics at Surfaces and Interfaces IV

O 45.7: Vortrag

Mittwoch, 20. März 2024, 12:00–12:15, MA 041

Ultrafast SHG imaging microscopy: imhomogeneities in space and time — •Marleen Axt¹, Jens Güdde¹, Markus B. Raschke², Gerson Mette¹, and Ulrich Höfer¹ — ¹Fachbereich Physik, Philipps-Universität Marburg, Germany — ²Department of Physics and JILA, University of Colorado, Boulder, USA

Ultrafast processes in 2D materials such as exciton or charge-transfer dynamics exhibit a broad range of time scales. They have been found to vary from sample to sample, are substrate dependent, or influenced by edges, grain boundaries and defects. Distinguishing the influence of these extrinsic effects from the intrinsic carrier dynamics has been challenging. In particular for 2D heterostructures, the emergent quantum phenomena are controlled by interlayer coupling and crystallographic orientation that are particularly sensitive to structural heterogeneities. Here, we present multi-scale imaging in a combination of time-resolved second-harmonic generation microscopy with nano-optical imaging to probe WS₂/WSe₂ heterostructures that reveal a large influence of different inhomogeneities on carrier dynamics.

Keywords: Ultrafast; TMD; Heterostructure; Nano-imaging