Exciton broadening in WS2 /graphene heterostructures

Hill, Heather M.; Rigosi, Albert F.; Raja, Archana; Chernikov, Alexey; Roquelet, Cyrielle; Heinz, Tony F.

doi:10.1103/PhysRevB.96.205401

Title: Exciton broadening in ${WS}_{2}$ /graphene heterostructures

Journal Article · Wed Nov 01 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.205401· OSTI ID:1410545

Hill, Heather M. ^[1]; Rigosi, Albert F. ^[1]; Raja, Archana ^[1]; Chernikov, Alexey ^[2]; Roquelet, Cyrielle ^[3]; Heinz, Tony F. ^[1]

Columbia Univ., New York, NY (United States); Stanford Univ., Stanford, CA (United States)
Columbia Univ., New York, NY (United States); Univ. of Regensburg, Regensburg (Germany)
Columbia Univ., New York, NY (United States); ArcelorMittal Maizieres Research SA, Maizieres-les-Metz (France)

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.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Re-Defining Photovoltaic Efficiency Through Molecule Scale Control (RPEMSC); SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-76SF00515; SC0001085; DMR-1122594; DGE-1069240; CH 1672/1-1

OSTI ID:: 1410545

Alternate ID(s):: OSTI ID: 1406391

Journal Information:: Physical Review B, Vol. 96, Issue 20; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 38 works

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