期刊
NANO LETTERS
卷 17, 期 7, 页码 4210-4216出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b01034
关键词
Monolayer WS2; exciton; plasma; Lennard-Jones potential; ultrafast optics; many-body theory
类别
资金
- U.S. Department of Energy, BES DMSE
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF4540]
- Center for Excitonics, an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences [DE-SC0001088]
- AFOSR [FA9550-16-1-0382]
- STC Center for Integrated Quantum Materials
- NSF [DMR-1231319]
- AOARD [FA2386-16-1-4009]
- Ministry of Science and Technology [MoST 105-2112-M-007-032-MY3, MoST 105-2119-M-007-027]
- Academia Sinica Research Program on Nanoscience and Nanotechnology, Taiwan
- Deutsche Forschungsgemeinschaft
We report a rare atom-like interaction between excitons in monolayer WS2, measured using ultrafast absorption spectroscopy. At increasing excitation density, the exciton resonance energy exhibits a pronounced redshift followed by an anomalous blueshift. Using both material-realistic computation and phenomenological modeling, we attribute this observation to plasma effects and an attraction repulsion crossover of the exciton exciton interaction that mimics the Lennard-Jones potential between atoms. Our experiment demonstrates a strong analogy between excitons and atoms with respect to interparticle interaction, which holds promise to pursue the predicted liquid and crystalline phases of excitons in two-dimensional materials.
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