Observation of Exciton Redshift–Blueshift Crossover in Monolayer WS₂
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1804.10347.pdf
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Author(s)
Sie, Edbert Jarvis
Steinhoff, A.
Gies, C.
Lui, C. H.
Ma, Qing
Rösner, M.
Schönhoff, G.
Jahnke, F.
Wehling, T. O.
Lee, Y.-H.
Date Issued
July 2017
Journal
Nano Letters
Publisher
American Chemical Society (ACS)
Citation
Sie, E. J. et al. “Observation of Exciton Redshift–Blueshift Crossover in Monolayer WS₂.” Nano Letters 17, 7 (June 2017): 4210–4216 © 2017 American Chemical Society
Version
Author's final manuscript
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 interparticle interaction, which holds promise to pursue the predicted liquid and crystalline phases of excitons in two-dimensional materials.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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DOI of Published Version
https://doi.org/10.1021/ACS.NANOLETT.7B01034
