SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 34: Ultrafast Electron Dynamics at Surface and Interfaces III
O 34.4: Vortrag
Dienstag, 28. März 2023, 11:15–11:30, TRE Phy
Probing the ultrafast hole-transfer mechanism in a twisted TMD heterostructure — •Marcel Reutzel1, Jan Philipp Bange1, David Schmitt1, Wiebke Bennecke1, Giuseppe Meneghini2, AbdulAziz AlMutairi3, Daniel Steil1, Sabine Steil1, R. Thomas Weitz1, Samuel Brem2, G. S. Mathijs Jansen1, Stephan Hofmann3, Ermin Malic2, and Stefan Mathias1 — 1I. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany — 2Fachbereich Physik, Philipps-Universität, 35032 Marburg, Germany — 3Department of Engineering, University of Cambridge, Cambridge CB3 0FA, U.K.
In type-II band aligned TMD heterostructures, long-lived interlayer excitons (ILX) can be formed via two different processes: Optically excited intralayer excitons either transfer the exciton’s electron or hole component across the interface. Using momentum microscopy [Rev. Sci. Ins. 91, 063905 (2020)], we have shown that the transfer of the exciton’s electron proceeds via exciton-phonon scattering and layer hybridized Σ-excitons [Schmitt et al., Nature 608, 499 (2022)].
In this contribution, we show that the Coulomb correlation between the exciton’s hole and electron can be used to probe the hole-transfer dynamics: The intralayer exciton’s hole transfers from the VBM of MoS2 into the VBM of WSe2, which is imprinted onto the photoemission signal as an apparant upshift of the mean photoelectron energy. Our analysis provides new insights on the ultrafast hole-transfer mechanism in the WSe2/MoS2 heterostructure, and, more generally, on the photoemission signature of Coulomb correlated electron-hole pairs.