Journal
PHYSICAL REVIEW B
Volume 96, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.96.205401
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Funding
- US Department of Energy, Office of Basic Energy Sciences [DE-SC0001085]
- National Science Foundation [DMR-1122594]
- NSF through an IGERT Fellowship [DGE-1069240]
- NSF through a Graduate Research Fellowship
- Keck Foundation
- Alexander von Humboldt Foundation through a Feodor Lynen Research Fellowship
- Deutsche Forschungsgemeinschaft through Emmy Noether Programme [CH 1672/1-1]
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We have used optical spectroscopy to observe spectral broadening of WS2 exciton reflectance peaks in heterostructures of monolayer WS2 capped with mono- to few-layer graphene. The broadening is found to be similar for the A and B excitons and on the order of 5-10 meV. No strong dependence on the number of graphene layers was observed within experimental uncertainty. The broadening can be attributed to charge- and energy-transfer processes between the two materials, providing an observed lower bound for the corresponding time scales of 65 fs.
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