Tip-induced excitonic luminescence nanoscopy of an atomically-resolved van der Waals heterostructure

Abstract

Low-temperature scanning tunneling microscopy is used to probe, with atomic-scale spatial resolution, the intrinsic luminescence of a van der Waals heterostructure, made of a transition metal dichalcogenide monolayer stacked onto a few-layer graphene flake supported by an Au(111) substrate. Sharp emission lines arising from neutral, charged and localised excitons are reported. Their intensities and emission energies vary as a function of the nanoscale environment of the van der Waals heterostructure, explaining the variability of the emission properties observed with diffraction-limited approaches. Our work paves the way towards understanding and control of optoelectronic phenomena in moiré superlattices with atomic-scale resolution.

arXiv comment14 pages, 4 figures, 3 supplementary figures

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• Roadmap for Photonics with 2D Materials
• Active control of excitonic strong coupling and electroluminescence in electrically driven plasmonic nanocavities
• Impacts of dielectric screening on the luminescence of monolayer WSe${}_2$
• Nano-optics of transition metal dichalcogenides and their van der Waals heterostructures with electron spectroscopies
• Creation and Microscopic Origins of Single-Photon Emitters in Transition Metal Dichalcogenides and Hexagonal Boron Nitride
• Orbitally resolved single-photon emission from an individual atomic vacancy center in a semiconductor
• Sub-diffraction-resolved spatial distribution of emitting excitons in STM-induced luminescence of 2D semiconductors via Richardson-Lucy deconvolution