Description
This talk reviews our efforts to probe van der Waals heterostructures in- and out-of-plane at the nanometer scale, with a focus on the optical properties of transition metal dichalcogenide (TMD)/graphene heterobilayers.
We exploit van der Waals engineering and diffraction-limited optical spectroscopy to precisely probe interfacial coupling between TMD monolayers and graphene through excitons [1,2] and phonons [1,3] and unravel intriguing physical effects driven by charge energy transfer [1,2] and dielectric screening [3]. Further insights are provided by optical spectroscopy studies within a scanning tunneling microscope (STM-induced excitonic emission) [4] and within a strain tunable drum-like structure [5].
Acknowledgement: This was work done within the Nano-Optics and Low-Dimensional Materials team at IPCMS, in collaboration with the STM team at IPCMS and the LPCNO (INSA Toulouse).
References:
[1] G. Froehlicher et al., PRX 8, 011007 (2018)
[2] E. Lorchat, L. E. Parra López et al., Nat. Nano. 15, 283 (2020)
[3] L. Moczko et al., PRX 15, 021043 (2025)
[4] L. E. Parra López et al., Nat. Mater. 22, 482 (2023)
[5] L. Moczko, PhD thesis
