ArticleScience advances2024
Probing electron-hole Coulomb correlations in the exciton landscape of a twisted semiconductor heterostructure.
Article in Science advances, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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5 citing papers in PubMed.
- ARPES Signatures of Trions in van der Waals Materials.Nano letters · 2026Article
- Advanced Characterization of the Spatial Variation of Moiré Heterostructures and Moiré Excitons.Small (Weinheim an der Bergstrasse, Germany) · 2025Review
- Hybrid Frenkel-Wannier excitons facilitate ultrafast energy transfer at a 2D-organic interface.Nature physics · 2025Article
- Observation of Floquet states in graphene.Nature physics · 2025Article
- Twisted MoSeNano letters · 2024Article
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Authors and funding
16 authors.
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Abstract
In two-dimensional semiconductors, cooperative and correlated interactions determine the material's excitonic properties and can even lead to the creation of correlated states of matter. Here, we study the fundamental two-particle correlated exciton state formed by the Coulomb interaction between single-particle holes and electrons. We find that the ultrafast transfer of an exciton's hole across a type II band-aligned semiconductor heterostructure leads to an unexpected sub-200-femtosecond upshift of the single-particle energy of the electron being photoemitted from the two-particle exciton state. While energy relaxation usually leads to an energetic downshift of the spectroscopic signature, we show that this upshift is a clear fingerprint of the correlated interaction of the electron and hole parts of the exciton. In this way, time-resolved photoelectron spectroscopy is straightforwardly established as a powerful method to access electron-hole correlations and cooperative behavior in quantum materials. Our work highlights this capability and motivates the future study of optically inaccessible correlated excitonic and electronic states of matter.
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