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  Spectroscopic view of ultrafast charge carrier dynamics in single- and bilayer transition metal dichalcogenide semiconductors

Majchrzak, P., Volckaert, K., Čabo, A. G., Biswas, D., Bianchi, M., Mahatha, S. K., et al. (2021). Spectroscopic view of ultrafast charge carrier dynamics in single- and bilayer transition metal dichalcogenide semiconductors. Journal of Electron Spectroscopy and Related Phenomena, 250: 147093, pp. 1-7. doi:10.1016/j.elspec.2021.147093.

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 Creators:
Majchrzak, Paulina1, Author
Volckaert, Klara1, Author
Čabo, Antonija Grubišić1, Author
Biswas, Deepnarayan1, Author
Bianchi, Marco1, Author
Mahatha, Sanjoy K.1, Author
Dendzik, Maciej1, Author
Andreatta, Federico1, Author
Grønborg, Signe S.1, Author
Marković, Igor2, Author           
Riley, Jonathon M.1, Author
Johannsen, Jens C.1, Author
Lizzit, Daniel1, Author
Bignardi, Luca1, Author
Lizzit, Silvano1, Author
Cacho, Cephise1, Author
Alexander, Oliver1, Author
Matselyukh, Dan1, Author
Wyatt, Adam S.1, Author
Chapman, Richard T.1, Author
Springate, Emma1, AuthorLauritsen, Jeppe V.1, AuthorKing, Phil D. C.1, AuthorSanders, Charlotte E.1, AuthorMiwa, Jill A.1, AuthorHofmann, Philip1, AuthorUlstrup, Søren1, Author more..
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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Free keywords: Bandgap renormalization, Time-and angle-resolved photoemission spectroscopy, Transition metal dichalcogenides, Ultrafast carrier dynamics, Conduction bands, Dynamics, Electronic structure, Gold compounds, Gold metallography, Graphene, Layered semiconductors, Molybdenum compounds, Photoelectron spectroscopy, Silver metallography, Transition metals, Tungsten compounds, Angle resolved photoemission spectroscopy, Charge carrier dynamics, Quasiparticle spectrum, Semiconducting transition, Transient conduction, Transient electronics, Transition metal dichalcogenides, Ultrafast carrier dynamics, Substrates
 Abstract: The quasiparticle spectra of atomically thin semiconducting transition metal dichalcogenides (TMDCs) and their response to an ultrafast optical excitation critically depend on interactions with the underlying substrate. Here, we present a comparative time- and angle-resolved photoemission spectroscopy (TR-ARPES) study of the transient electronic structure and ultrafast carrier dynamics in the single- and bilayer TMDCs MoS2 and WS2 on three different substrates: Au(111), Ag(111) and graphene/SiC. The photoexcited quasiparticle bandgaps are observed to vary over the range of 1.9–2.5 eV between our systems. The transient conduction band signals decay on a sub-50 fs timescale on the metals, signifying an efficient removal of photoinduced carriers into the bulk metallic states. On graphene, we instead observe a fast timescale on the order of 170 fs, followed by a slow dynamics for the conduction band decay in MoS2. These timescales are explained by Auger recombination involving MoS2 and in-gap defect states. In bilayer TMDCs on metals we observe a complex redistribution of excited holes along the valence band that is substantially affected by interactions with the continuum of bulk metallic states. © 2021 The Author(s)

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Language(s): eng - English
 Dates: 2021-06-192021-06-19
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.elspec.2021.147093
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Title: Journal of Electron Spectroscopy and Related Phenomena
  Abbreviation : J. Electron Spectrosc. Relat. Phenom.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B.V.
Pages: - Volume / Issue: 250 Sequence Number: 147093 Start / End Page: 1 - 7 Identifier: ISSN: 0368-2048
CoNE: https://pure.mpg.de/cone/journals/resource/954925524767