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  Ultrafast photocurrents in MoSe2 probed by terahertz spectroscopy

Yagodkin, D., Nadvornik, L., Gückstock, O., Gahl, C., Kampfrath, T., & Bolotin, K. I. (2021). Ultrafast photocurrents in MoSe2 probed by terahertz spectroscopy. 2D Materials, 8(2): 025012. doi:10.1088/2053-1583/abd527.

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 Creators:
Yagodkin, Denis1, Author
Nadvornik, Lukas2, 3, Author              
Gückstock, Oliver1, 2, Author              
Gahl, Cornelius1, Author
Kampfrath, Tobias1, 2, Author              
Bolotin, Kirill I.1, Author
Affiliations:
1Department of Physics, Freie Universität Berlin, ou_persistent22              
2Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
3Faculty of Mathematics and Physics, Charles University, ou_persistent22              

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Free keywords: Condensed Matter, Mesoscale and Nanoscale Physics, cond-mat.mes-hall, Physics, Optics, physics.optics
 Abstract: We use the terahertz (THz) emission spectroscopy to study femtosecond photocurrent dynamics in the prototypical 2D semiconductor, transition metal dichalcogenide MoSe2. We identify several distinct mechanisms producing THz radiation in response to an ultrashort (30 fs) optical excitation in a bilayer (BL) and a multilayer (ML) sample. In the ML, the THz radiation is generated at a picosecond timescale by out-of-plane currents due to the drift of photoexcited charge carriers in the surface electric field. The BL emission is generated by an in-plane shift current. Finally, we observe oscillations at about 23 THz in the emission from the BL sample. We attribute the oscillations to quantum beats between two excitonic states with energetic separation of 100 meV.

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Language(s): eng - English
 Dates: 2020-08-272020-09-092020-12-182021-04
 Publication Status: Published online
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -

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Project name : TERAMAG - Ultrafast spin transport and magnetic order controlled by terahertz electromagnetic pulses
Grant ID : 681817
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: 2D Materials
Source Genre: Journal
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Publ. Info: Bristol : IOP Publ.
Pages: 7 Volume / Issue: 8 (2) Sequence Number: 025012 Start / End Page: - Identifier: ISSN: 2053-1583
CoNE: https://pure.mpg.de/cone/journals/resource/2053-1583