Confined-state physics and signs of fermionization of moiré excitons in WSe 2 /MoSe 2 heterobilayers
2023; IOP Publishing; Volume: 10; Issue: 3 Linguagem: Inglês
10.1088/2053-1583/acd265
ISSN2053-1583
AutoresFrederik Lohof, Johannes Michl, Alexander Steinhoff, Bo Han, Martin von Helversen, Sefaattin Tongay, Kenji Watanabe, Takashi Taniguchi, Sven Höfling, S. Reitzenstein, C. Antón, Christopher Gies, Christian Schneider,
Tópico(s)Molecular Junctions and Nanostructures
ResumoWe revisit and extend the standard bosonic interpretation of interlayer excitons in the moir\'e potential of twisted heterostructures of transition-metal dichalcogenides. In our experiments, we probe a high quality MoSe$_2$/WSe$_2$ van der Waals bilayer heterostructure via density-dependent photoluminescence spectroscopy and reveal strongly developed, unconventional spectral shifts of the emergent moir\'e exciton resonances. The observation of saturating blueshifts of successive exciton resonances allow us to explain their physics in terms of a model utilizing fermionic saturable absorbers. This approach is strongly inspired by established quantum-dot models, which underlines the close analogy of interlayer excitons trapped in pockets of the moir\'e potential, and quantum emitters with discrete eigenstates.
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