Journal
NATURE PHOTONICS
Volume 9, Issue 7, Pages 466-U69Publisher
NATURE RESEARCH
DOI: 10.1038/NPHOTON.2015.104
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Funding
- US Department of Energy, Office of Science, Office of Basic Energy Sciences
- Columbia University through the Energy Frontier Research Center [DE-SC0001085]
- SLAC National Accelerator Laboratory through the AMOS programme within the Chemical Sciences, Geosciences and Biosciences Division
- Keck Foundation
- Air Force Office of Scientific Research [FA9550-14-1-0268]
- Alexander von Humboldt Foundation within the Feodor Lynen Research Fellowship programme
- NSF [DGE-1144155, DGE-1069240]
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Control of the optical properties of matter on ultrashort timescales is of both fundamental interest and central importance for applications in photonics. It is desirable to achieve pronounced changes over a broad spectral range using the least possible amount of material. Here, we demonstrate a dramatic change over a spectral range of hundreds of meV on the femtosecond timescale in the optical response of atomically thin two-dimensional crystals of the transition-metal dichalcogenide WS2 following excitation by intense optical pump pulses. Our findings reveal the role of extremely strong Coulomb interactions. At the direct gap, we observe a Mott transition from excitonic states to free carriers, accompanied by a giant bandgap renormalization of approximately 500 meV and the development of population inversion.
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