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  Excited-state band structure mapping

Puppin, M., Nicholson, C. W., Monney, C., Deng, Y., Xian, R. P., Feldl, J., et al. (2021). Excited-state band structure mapping.

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2108.07099.pdf (Preprint), 22MB
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https://arxiv.org/abs/2108.07099 (Preprint)
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 Creators:
Puppin, M.1, 2, Author
Nicholson, C. W.3, Author
Monney, C.3, Author
Deng, Y.4, Author
Xian, R. P.2, Author
Feldl, J.2, Author
Dong, S.2, Author
Dominguez, A.5, 6, Author
Hübener, H.7, 8, Author              
Rubio, A.7, 8, 9, 10, Author              
Wolf, M.2, Author
Rettig, L.2, Author
Ernstorfer, R.2, 11, Author
Affiliations:
1Laboratoire de Spectroscopie Ultrarapide and Lausanne Centre for Ultrafast Science (LACUS), cole Polytechnique Fdrale de Lausanne, ISIC, ou_persistent22              
2Fritz-Haber-Institut der Max-Planck-Gesellschaft, ou_persistent22              
3Department of physics and Fribourg centre for nanomaterials, University of Fribourg, ou_persistent22              
4Paul Scherrer Institute, SwissFEL, ou_persistent22              
5Shenzhen JL Computational Science and Applied Research Institute, ou_persistent22              
6Beijing Computational Science Research Center, ou_persistent22              
7Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
8Center for Free Electron Laser Science, ou_persistent22              
9Center for Computational Quantum Physics, Flatiron Institute, ou_persistent22              
10Nano-Bio Spectroscopy Group, Universidad del Paìs Vasco UPV/EHU, ou_persistent22              
11Institut für Optik und Atomare Physik, Technische Universität Berlin, ou_persistent22              

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Free keywords: Condensed Matter, Materials Science, cond-mat.mtrl-sci
 Abstract: Angle-resolved photoelectron spectroscopy is an extremely powerful probe of materials to access the occupied electronic structure with energy and momentum resolution. However, it remains blind to those dynamic states above the Fermi level that determine technologically relevant transport properties. In this work, we extend band structure mapping into the unoccupied states and across the entire Brillouin zone by using a state-of-the-art high repetition rate, extreme ultraviolet fem- tosecond light source to probe optically excited samples. The wide-ranging applicability and power of this approach are demonstrated by measurements on the 2D semiconductor WSe2, where the energy-momentum dispersion of valence and conduction bands are observed in a single experiment. This provides a direct momentum-resolved view not only on the complete out-of-equilibrium band gap but also on its renormalization induced by electron-hole interaction and screening. Our work establishes a new benchmark for measuring the band structure of materials, with direct access to the energy-momentum dispersion of the excited-state spectral function.

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Language(s): eng - English
 Dates: 2021-08-16
 Publication Status: Published online
 Pages: 28
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2108.07099
 Degree: -

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