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  Direct evidence for efficient ultrafast charge separation in epitaxial WS2/graphene heterostructures

Aeschlimann, S., Rossi, A., Chavez Cervantes, M., Krause, R., Arnoldi, B., Stadtmüller, B., et al. (2020). Direct evidence for efficient ultrafast charge separation in epitaxial WS2/graphene heterostructures. Science Advances, 6(20): eaay0761. doi:10.1126/sciadv.aay0761.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-6604-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-6605-2
Genre: Journal Article

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https://arxiv.org/abs/1904.01379 (Preprint)
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https://dx.doi.org/10.1126/sciadv.aay0761 (Publisher version)
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 Creators:
Aeschlimann, S.1, 2, 3, Author
Rossi, A.4, 5, Author
Chavez Cervantes, M.2, 6, Author              
Krause, R.1, 2, 3, Author
Arnoldi, B.7, Author
Stadtmüller, B.7, Author
Aeschlimann, M.7, Author
Forti, S.4, Author
Fabbri, F.5, 6, 7, Author
Coletti, C.4, 8, Author
Gierz, I.1, 2, 3, Author
Affiliations:
1Ultrafast Electron Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_persistent22              
2Center for Free Electron Laser Science, ou_persistent22              
3University of Regensburg, Institute for Experimental and Applied Physics, ou_persistent22              
4Center for Nanotechnology Innovation at NEST, Istituto Italiano di Tecnologia, ou_persistent22              
5NEST, Istituto Nanoscienze, CNR and Scuola Normale Superiore, ou_persistent22              
6International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266714              
7University of Kaiserslautern, Department of Physics and Research Center OPTIMAS, ou_persistent22              
8Graphene Labs, Istituto Italiano di Tecnologia, ou_persistent22              

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 Abstract: We use time- and angle-resolved photoemission spectroscopy (tr-ARPES) to investigate ultrafast charge transfer in an epitaxial heterostructure made of monolayer WS2 and graphene. This heterostructure combines the benefits of a direct-gap semiconductor with strong spin-orbit coupling and strong light-matter interaction with those of a semimetal hosting massless carriers with extremely high mobility and long spin lifetimes. We find that, after photoexcitation at resonance to the A-exciton in WS2, the photoexcited holes rapidly transfer into the graphene layer while the photoexcited electrons remain in the WS2 layer. The resulting charge-separated transient state is found to have a lifetime of ∼1 ps. We attribute our findings to differences in scattering phase space caused by the relative alignment of WS2 and graphene bands as revealed by high-resolution ARPES. In combination with spin-selective optical excitation, the investigated WS2/graphene heterostructure might provide a platform for efficient optical spin injection into graphene.

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Language(s): eng - English
 Dates: 2019-05-172020-03-022020-05-13
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: arXiv: 1904.01379
DOI: 10.1126/sciadv.aay0761
 Degree: -

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Project name : -
Grant ID : 696656
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

Source 1

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Title: Science Advances
  Other : Sci. Adv.
Source Genre: Journal
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Publ. Info: Washington : AAAS
Pages: - Volume / Issue: 6 (20) Sequence Number: eaay0761 Start / End Page: - Identifier: ISSN: 2375-2548
CoNE: https://pure.mpg.de/cone/journals/resource/2375-2548