Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Poster Monday: 2D Materials 1
O 18.25: Poster
Montag, 5. September 2022, 18:00–20:00, P4
Tip-induced excitonic luminescence of an atomically-resolved van der Waals heterostructure — •Luis Parra Lopez1,2, Anna Roslawska2, Fabrice Scheurer2, Stéphane Berciaud2, and Guillaume Schull2 — 1Department of Physical Chemistry,Fritz Haber Institute of the Max Planck Society, 14195 Berlin,Germany. — 2Université de Strasbourg,CNRS,IPCMS,UMR 7504,67000 Strasbourg,France.
Van der Waals heterostructures (vdWH) made from stacks of transition metal dichalcogenides and other 2D-materials are appealing systems to investigate light-matter interaction.Their optical response is dominated by tightly bound excitons that are sensitive to the presence of atomic-scale inhomogeneities.These inhomogeneities lie at length-scales below the spatial resolution accessible with standard optical spectroscopies.Here, we present an approach using a scanning tunneling microscope to induce the luminescence of an MoSe2/FL-graphene vdWH [1].We correlate the atomic-scale landscape with the locally induced optical response and observe sizeable variations in the excitonic emission between different nm-sized areas.This study paves the way for novel investigations regarding the local properties of vdWH and highly localized excitons.To gain deeper insight into interlayer coupling mechanisms on the nanoscale, which occur on sub-ps timescales, requires additional high temporal resolution as well.I thus conclude with an outlook of an experimental setup capable of addressing ultrafast dynamics with fs-temporal and nm-spatial resolution[2].[1] Parra et al, arXiv:2204.14022(2022).[2] Müller et al, ACS photonics, 7(8),(2020).