Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 12: Scanning probe microscopy: light matter interaction at atomic scales
O 12.9: Vortrag
Montag, 9. März 2026, 17:00–17:15, HSZ/0403
Atomic-scale excitonic luminescence nanoscopy of moiré superlattices in van der Waals heterostructures — •Manas Pratim Biswas1, Fábio J. R. Costa1, Elise Jouaiti1, Arnaud Gloppe1, Katharina Kaiser1,2, Fabrice Scheurer1, Stéphane Berciaud1, and Guillaume Schull1 — 1Institut de Physique et de Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (CNRS, UMR 7504), Strasbourg, France — 24th Physical Institute-Solids and Nanostructures, Georg-August-Universität Göttingen, Göttingen, Germany
Atomically thin two-dimensional materials are susceptible to their environment, and stacking them into van der Waals heterostructures allows precise control of their electronic and optical properties. In semiconducting transition metal dichalogenides, excitons dominate the optical response whose properties can be tuned through interfacial interactions. Twisted and/or lattice-mismatched bilayers form a moiré superlattice that periodically modulates the electronic landscape. However, diffraction-limited optical methods average over micrometer scales, concealing these nanoscale effects. To overcome this, we employ cryogenic scanning tunneling microscope-induced luminescence1 (STML, <7K, ultra-high vacuum) to probe exciton-moiré interplay in near-aligned WSe2/WS2 heterobilayers2,3. STML enables simultaneous atomic-scale imaging and local optical readout, with the ultimate aim of demonstrating nano-optical probing of moiré-modulated systems. References: 1. Nat. Mat. 22, 482 (2023) 2. Nat. Phys. 19, 1286 (2023) 3. Nat. Mat. 20, 945 (2021)
Keywords: Scanning Tunneling Microscope-induced Luminescence; 2D Materials; Moiré Superlattice; Light-Matter Interaction at Atomic Scales; Transition Metal Dichalcogenide