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Title: Exciton broadening in WS 2 /graphene heterostructures

Here, we have used optical spectroscopy to observe spectral broadening of WS 2 exciton reflectance peaks in heterostructures of monolayer WS 2 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.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [1]
  1. Columbia Univ., New York, NY (United States); Stanford Univ., Stanford, CA (United States)
  2. Columbia Univ., New York, NY (United States); Univ. of Regensburg, Regensburg (Germany)
  3. Columbia Univ., New York, NY (United States); ArcelorMittal Maizieres Research SA, Maizieres-les-Metz (France)
Publication Date:
Grant/Contract Number:
AC02-76SF00515; SC0001085; DMR-1122594; DGE-1069240; CH 1672/1-1
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 20; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1410545
Alternate Identifier(s):
OSTI ID: 1406391

Hill, Heather M., Rigosi, Albert F., Raja, Archana, Chernikov, Alexey, Roquelet, Cyrielle, and Heinz, Tony F.. Exciton broadening in WS2 /graphene heterostructures. United States: N. p., Web. doi:10.1103/PhysRevB.96.205401.
Hill, Heather M., Rigosi, Albert F., Raja, Archana, Chernikov, Alexey, Roquelet, Cyrielle, & Heinz, Tony F.. Exciton broadening in WS2 /graphene heterostructures. United States. doi:10.1103/PhysRevB.96.205401.
Hill, Heather M., Rigosi, Albert F., Raja, Archana, Chernikov, Alexey, Roquelet, Cyrielle, and Heinz, Tony F.. 2017. "Exciton broadening in WS2 /graphene heterostructures". United States. doi:10.1103/PhysRevB.96.205401. https://www.osti.gov/servlets/purl/1410545.
@article{osti_1410545,
title = {Exciton broadening in WS2 /graphene heterostructures},
author = {Hill, Heather M. and Rigosi, Albert F. and Raja, Archana and Chernikov, Alexey and Roquelet, Cyrielle and Heinz, Tony F.},
abstractNote = {Here, 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.},
doi = {10.1103/PhysRevB.96.205401},
journal = {Physical Review B},
number = 20,
volume = 96,
place = {United States},
year = {2017},
month = {11}
}

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