4.6 Article

Exciton broadening in WS2/graphene heterostructures

Journal

PHYSICAL REVIEW B
Volume 96, Issue 20, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.96.205401

Keywords

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Funding

  1. US Department of Energy, Office of Basic Energy Sciences [DE-SC0001085]
  2. National Science Foundation [DMR-1122594]
  3. NSF through an IGERT Fellowship [DGE-1069240]
  4. NSF through a Graduate Research Fellowship
  5. Keck Foundation
  6. Alexander von Humboldt Foundation through a Feodor Lynen Research Fellowship
  7. 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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