Speaker : Eric Le Moal – Institut des Sciences Moléculaires d’Orsay (ISMO)

Abstract : Few-atom-thick (2D) luminescent materials, such as monolayer transition metal dichalcogenides (TMDs), are in the spotlight for their potential applications in optoelectronic nanodevices. Recently, the use of scanning tunneling microscopy (STM) to locally induce light has emerged as a unique nanoprobe of the elementary excitation and emission processes in monolayer TMDs. In this seminar, I will review five years of successful collaboration between IPCMS and ISMO in this area. Using a unique setup combining optical microscopy and tunneling microscopy in ambient air, we have demonstrated the generation of excitons by inelastic tunneling in MoSe2 and WS2 monolayers [1,2]. Moreover, this combination of techniques opens new perspectives for the study of exciton-charge carrier interactions in this class of materials [3].

[1] D. Pommier et al, Phys. Rev. Lett. 123, 027402 (2019)
[2] R. J. Peña Román et al, Phys. Rev. B 106, 085419 (2022)
[3] R. J. Peña Román et al, Nano Lett. 22, 9244 (2022)

If you wish to meet the speaker, please contact :

Stéphane BERCIAUD (berciaud@unistra.fr) et Guillaume SCHULL (schull@unistra.fr )