Atomically thin semiconductors can be stacked on top of each other with limitless possibilities because there is no need for chemical compatibility or lattice match. Combining these materials leads to the emergence of a broad gamut of new physical phenomena. Here, we will focus on different aspects of interlayer excitons which are bound electron-hole pairs whose individual constituents reside in different layers. In van der Waals heterostructures, excitons can be direct or indirect in real space, affected by the underlying (moiré) superlattice, or used as a probe for correlated electronic states. We will discuss these different features in the talk of the day.
Reference: Mak & Shan, Nature Nanotechnology 17, 686-695 (2022)
Additional references:
Mahdikhanysarvejahany, F., Shanks, D.N., Klein, M. et al. Localized interlayer excitons in MoSe2–WSe2 heterostructures without a moiré potential. Nat Commun 13, 5354 (2022). https://www.nature.com/articles/s41467-022-33082-6
Jin, C., Regan, E.C., Yan, A. et al. Observation of moiré excitons in WSe2/WS2 heterostructure superlattices. Nature 567, 76–80 (2019). https://doi.org/10.1038/s41586-019-0976-y
Additional references:
Mahdikhanysarvejahany, F., Shanks, D.N., Klein, M. et al. Localized interlayer excitons in MoSe2–WSe2 heterostructures without a moiré potential. Nat Commun 13, 5354 (2022). https://www.nature.com/articles/s41467-022-33082-6
Jin, C., Regan, E.C., Yan, A. et al. Observation of moiré excitons in WSe2/WS2 heterostructure superlattices. Nature 567, 76–80 (2019). https://doi.org/10.1038/s41586-019-0976-y
Please register at this doodle if you want to join for the pizza!
Location: Stuckelberg, Ecole de Physique
Time: Friday 21 April 2023, 12:10 for pizza, 12:30 start discussion