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  Femtosecond exciton dynamics in WSe2 optical waveguides

Sternbach, A. J., Latini, S., Chae, S., Hübener, H., de Giovannini, U., Shao, Y., et al. (2020). Femtosecond exciton dynamics in WSe2 optical waveguides. Nature Communications, 11(1): 3567. doi:10.1038/s41467-020-17335-w.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-D010-C Version Permalink: http://hdl.handle.net/21.11116/0000-0006-D011-B
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https://dx.doi.org/10.1038/s41467-020-17335-w (Publisher version)
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 Creators:
Sternbach, A. J.1, Author
Latini, S.2, Author              
Chae, S.3, Author
Hübener, H.2, Author              
de Giovannini, U.2, Author              
Shao, Y.1, Author
Xiong, L.1, Author
Sun, Z.1, Author
Shi, N.1, Author
Kissin, P.4, Author
Ni, G.-X.1, Author
Rhodes, D.3, Author
Kim, B.3, Author
Yu, N.1, Author
Millis, A. J.1, Author
Fogler, M. M.4, Author
Schuck, P. J.3, Author
Lipson, M.5, Author
Zhu, X.-Y.6, Author
Hone, J.3, Author
Averitt, R. D.4, AuthorRubio, A.2, 7, Author              Basov, D. N.1, Author more..
Affiliations:
1Department of Physics, Columbia University, New York, ou_persistent22              
2Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
3Department of Mechanical Engineering, Columbia University, New York, ou_persistent22              
4Department of Physics, University of California, San Diego, ou_persistent22              
5Department of Electrical Engineering, Columbia University, New York, ou_persistent22              
6Department of Chemistry, Columbia University, New York, ou_persistent22              
7Center for Computational Quantum Physics (CCQ), Flatiron Institute, ou_persistent22              

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 Abstract: Van-der Waals (vdW) atomically layered crystals can act as optical waveguides over a broad range of the electromagnetic spectrum ranging from Terahertz to visible. Unlike common Si-based waveguides, vdW semiconductors host strong excitonic resonances that may be controlled using non-thermal stimuli including electrostatic gating and photoexcitation. Here, we utilize waveguide modes to examine photo-induced changes of excitons in the prototypical vdW semiconductor, WSe2, prompted by femtosecond light pulses. Using time-resolved scanning near-field optical microscopy we visualize the electric field profiles of waveguide modes in real space and time and extract the temporal evolution of the optical constants following femtosecond photoexcitation. By monitoring the phase velocity of the waveguide modes, we detect incoherent A-exciton bleaching along with a coherent optical Stark shift in WSe2.

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Language(s): eng - English
 Dates: 2020-04-232020-06-172020-07-16
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41467-020-17335-w
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 11 (1) Sequence Number: 3567 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723