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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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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-B307-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-5914-3
Genre: Journal Article

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 Creators:
Wegkamp, Daniel1, Author              
Herzog, Marc1, Author              
Xian, Lede2, 3, Author
Gatti, Matteo3, 4, 5, Author
Cudazzo, Pierluigi2, 3, Author
McGahan, Christina L.6, Author
Marvel, Robert E.6, Author
Haglund, Richard F.6, Author
Rubio, Angel2, 3, 7, 8, Author              
Wolf, Martin1, Author              
Stähler, Julia1, Author              
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              
8Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2074320              

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Free keywords: PACS numbers: 71.27.+a, 71.20.Be, 71.30.+h, 79.60.-i
 Abstract: 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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Language(s): eng - English
 Dates: 2014-07-152014-11-172014-11-21
 Publication Status: Published in print
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevLett.113.216401
arXiv: 1408.3209
 Degree: -

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Title: Physical Review Letters
  Other : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 113 (21) Sequence Number: 216401 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: /journals/resource/954925433406_1