Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 16: Poster Monday: Ultrafast Processes 1
O 16.2: Poster
Montag, 5. September 2022, 18:00–20:00, P4
Tailoring the carrier dynamics of WSe2 by the adsorption of CuPc — •Gregor Zinke1, Sebastian Hedwig1, Benito Arnoldi1, Martin Aeschlimann1, and Benjamin Stadtmueller1,2 — 1Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Erwin-Schroedinger-Str. 46, 67663 Kaiserslautern, Germany — 2Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany
Tailoring the electronic properties and carrier dynamics of 2D-Van-der-Waals materials is a highly promising way to design spin functionalities in low dimensions. This is often achieved by the formation of heterostructures with other Van-der-Waals materials.
Here, we functionalize the carrier dynamics of the prototypical Van-der-Waals material WSe2 by the adsorption of the aromatic molecule CuPc. Using time- and angle-resolved photoemission with XUV-radiation, we investigate the temporal evolution of the excited states at the K- and Σ-points of WSe2 after an optical excitation. For the bare WSe2, we find a spin selective excitation at the K-point depending on the pump light polarization [1], which is followed by a spin-flip scattering from the K- to the Σ-point. After the adsorption of CuPc, the excitation scheme is completely altered. In particular, we uncovered a direct interlayer excitation from the CuPc into the WSe2 layer that dominates the carrier dynamics of the CuPc/WSe2 heterostructure.
Reference: [1] Bertoni et al.; Phys. Rev. Lett. 117, 277201 (2016)