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Observation of exciton redshift-blueshift crossover in monolayer WS2
- Source :
- Nano Letters 17, 4210 (2017)
- Publication Year :
- 2018
-
Abstract
- 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 inter-particle interaction, which holds promise to pursue the predicted liquid and crystalline phases of excitons in two-dimensional materials.
- Subjects :
- Condensed Matter - Mesoscale and Nanoscale Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Nano Letters 17, 4210 (2017)
- Publication Type :
- Report
- Accession number :
- edsarx.1804.10347
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1021/acs.nanolett.7b01034