Journal
NATURE COMMUNICATIONS
Volume 9, Issue -, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-018-04877-3
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Funding
- European Research Council (ERC) [336749]
- Volkswagen Foundation
- German Excellence Initiative via the Nanosystems Initiative Munich (NIM)
- Center for NanoScience (CeNS)
- LMUinnovativ
- Swedish Research Council
- Stiftelsen Olle Engkvist
- European Unions [696656]
- DFG [SFB 951]
- National Science Foundation EFRI program [EFMA-1542741]
- Elemental Strategy Initiative by the MEXT, Japan
- JSPS KAKENHI Grant [JP15K21722, JP25106006]
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Monolayer transition metal dichalcogenides (TMDs) undergo substantial changes in the single-particle band structure and excitonic optical response upon the addition of just one layer. As opposed to the single-layer limit, the bandgap of bilayer (BL) TMD semiconductors is indirect which results in reduced photoluminescence with richly structured spectra that have eluded a detailed understanding to date. Here, we provide a closed interpretation of cryogenic emission from BL WSe2 as a representative material for the wider class of TMD semiconductors. By combining theoretical calculations with comprehensive spectroscopy experiments, we identify the crucial role of momentum-indirect excitons for the understanding of BL TMD emission. Our results shed light on the origin of quantum dot formation in BL crystals and will facilitate further advances directed at opto-electronic applications of layered TMD semiconductors in van der Waals heterostructures and devices.
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