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  Ultrafast Triggering of Insulator-Metal Transition in Two-Dimensional VSe2

Biswas, D., Jones, A. J. H., Majchrzak, P., Choi, B. K., Lee, T.-H., Volckaert, K., et al. (2021). Ultrafast Triggering of Insulator-Metal Transition in Two-Dimensional VSe2. Nano Letters, 21(5), 1968-1975. doi:10.1021/acs.nanolett.0c04409.

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 Creators:
Biswas, Deepnarayan1, Author
Jones, Alfred J. H.1, Author
Majchrzak, Paulina1, Author
Choi, Byoung Ki1, Author
Lee, Tsung-Han1, Author
Volckaert, Klara1, Author
Feng, Jiagui1, Author
Marković, Igor2, Author              
Andreatta, Federico1, Author
Kang, Chang-Jong1, Author
Kim, Hyuk Jin1, Author
Lee, In Hak1, Author
Jozwiak, Chris1, Author
Rotenberg, Eli1, Author
Bostwick, Aaron1, Author
Sanders, Charlotte E.1, Author
Zhang, Yu1, Author
Karras, Gabriel1, Author
Chapman, Richard T.1, Author
Wyatt, Adam S.1, Author
Springate, Emma1, AuthorMiwa, Jill A.1, AuthorHofmann, Philip1, AuthorKing, Phil D. C.1, AuthorChang, Young Jun1, AuthorLanatà, Nicola1, 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: charge density wave, metal-insulator transition, Single-layer VSe2, time- and angle-resolved photoemission spectroscopy, ultrafast dynamics, Charge density, Charge density waves, Degrees of freedom (mechanics), Metal insulator transition, Photoelectron spectroscopy, Transition metals, Electron-lattice interactions, Electronic effects, Insulating state, Insulator metal transition, Photoemission intensity, Spectral function, Transition metal dichalcogenides, Ultrafast optical switching, Selenium compounds
 Abstract: The transition-metal dichalcogenide VSe2 exhibits an increased charge density wave transition temperature and an emerging insulating phase when thinned to a single layer. Here, we investigate the interplay of electronic and lattice degrees of freedom that underpin these phases in single-layer VSe2 using ultrafast pump-probe photoemission spectroscopy. In the insulating state, we observe a light-induced closure of the energy gap, which we disentangle from the ensuing hot carrier dynamics by fitting a model spectral function to the time-dependent photoemission intensity. This procedure leads to an estimated time scale of 480 fs for the closure of the gap, which suggests that the phase transition in single-layer VSe2 is driven by electron-lattice interactions rather than by Mott-like electronic effects. The ultrafast optical switching of these interactions in SL VSe2 demonstrates the potential for controlling phase transitions in 2D materials with light. © 2021 American Chemical Society.

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Language(s): eng - English
 Dates: 2021-02-182021-02-18
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1021/acs.nanolett.0c04409
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Title: Nano Letters
  Abbreviation : Nano Lett.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 21 (5) Sequence Number: - Start / End Page: 1968 - 1975 Identifier: ISSN: 1530-6984
CoNE: https://pure.mpg.de/cone/journals/resource/110978984570403