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  Instantaneous Band Gap Collapse in Photoexcited Monoclinic VO2 due to Photocarrier Doping

Wegkamp, D., Herzog, M., Xian, L., Gatti, M., Cudazzo, P., McGahan, C. L., et al. (2014). Instantaneous Band Gap Collapse in Photoexcited Monoclinic VO2 due to Photocarrier Doping. Physical Review Letters, 113(21): 216401. doi:10.1103/PhysRevLett.113.216401.

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Wegkamp VO2 PRL 2014.pdf (Verlagsversion), 404KB
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Wegkamp VO2 PRL 2014.pdf
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2014
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APS
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 Urheber:
Wegkamp, Daniel1, Autor           
Herzog, Marc1, Autor           
Xian, Lede2, 3, Autor
Gatti, Matteo3, 4, 5, Autor
Cudazzo, Pierluigi2, 3, Autor
McGahan, Christina L.6, Autor
Marvel, Robert E.6, Autor
Haglund, Richard F.6, Autor
Rubio, Angel2, 3, 7, 8, Autor           
Wolf, Martin1, Autor           
Stähler, Julia1, Autor           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Nano-Bio Spectroscopy group, Universidad del País Vasco CFM CSIC-UPV/EHU-MPC & DIPC, 20018 San Sebastián, Spain, ou_persistent22              
3European Theoretical Spectroscopy Facility (ETSF), ou_persistent22              
4Laboratoire des Solides Irradiés, École Polytechnique, CNRS-CEA/DSM, F-91128 Palaiseau, France, ou_persistent22              
5Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette, France, ou_persistent22              
6Department of Physics and Astronomy and Interdisciplinary Materials Science Program, Vanderbilt University, Nashville, Tennessee 37235-1807, USA, ou_persistent22              
7Theory, Fritz Haber Institute, Max Planck Society, ou_634547              
8Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany, ou_persistent22              

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 Zusammenfassung: Using femtosecond time-resolved photoelectron spectroscopy we demonstrate that photoexcitation transforms monoclinic VO2 quasi-instantaneously into a metal. Thereby, we exclude an 80 fs structural bottleneck for the photoinduced electronic phase transition of VO2. First-principles many-body perturbation theory calculations reveal a high sensitivity of the VO2 band gap to variations of the dynamically screened Coulomb interaction, supporting a fully electronically driven isostructural insulator-to-metal transition. We thus conclude that the ultrafast band structure renormalization is caused by photoexcitation of carriers from localized V 3d valence states, strongly changing the screening before significant hot-carrier relaxation or ionic motion has occurred.

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Sprache(n): eng - English
 Datum: 2014-07-152014-11-172014-11-21
 Publikationsstatus: Erschienen
 Seiten: 5
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1103/PhysRevLett.113.216401
 Art des Abschluß: -

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Titel: Physical Review Letters
  Andere : Phys. Rev. Lett.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Woodbury, N.Y. : American Physical Society
Seiten: - Band / Heft: 113 (21) Artikelnummer: 216401 Start- / Endseite: - Identifikator: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1