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  Ultrafast Electronic Band Gap Control in an Excitonic Insulator

Mor, S., Herzog, M., Golež, D., Werner, P., Eckstein, M., Katayama, N., et al. (2017). Ultrafast Electronic Band Gap Control in an Excitonic Insulator. Physical Review Letters, 119(8): 086401. doi:10.1103/PhysRevLett.119.086401.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-002D-9D6E-1 Version Permalink: https://hdl.handle.net/21.11116/0000-0001-5273-1
Genre: Journal Article

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 Creators:
Mor, Selene1, Author           
Herzog, Marc1, 2, Author           
Golež, Denis3, Author
Werner, Philipp3, Author
Eckstein, Martin4, Author
Katayama, Naoyuki5, Author
Nohara, Minoru6, Author
Takagi, Hide7, 8, Author
Mizokawa, Takashi9, Author
Monney, Claude10, Author
Stähler, Julia1, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Institute for Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany, ou_persistent22              
3Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland, ou_persistent22              
4Department of Physics, University of Erlangen-Nürnberg, Staudtstrasse 7-B2, 91058 Erlangen, Germany, ou_persistent22              
5Department of Physical Science and Engineering, Nagoya University, 464-8603 Nagoya, Japan, ou_persistent22              
6Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan, ou_persistent22              
7Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany, ou_persistent22              
8Dept. of Physics, Univ. of Tokyo, 113-8654 Tokyo, Japan, ou_persistent22              
9Dept. of Applied Physics, Waseda Univ., 169-8555 Tokyo, Japan, ou_persistent22              
10Institute of Physics, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland, ou_persistent22              

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Free keywords: Condensed Matter, Strongly Correlated Electrons, cond-mat.str-el
 Abstract: We report on the nonequilibrium dynamics of the electronic structure of the layered semiconductor Ta2NiSe5 investigated by time- and angle-resolved photoelectron spectroscopy. We show that below the critical excitation density of FC=0.2  mJ cm−2, the band gap narrows transiently, while it is enhanced above FC. Hartree-Fock calculations reveal that this effect can be explained by the presence of the low-temperature excitonic insulator phase of Ta2NiSe5, whose order parameter is connected to the gap size. This work demonstrates the ability to manipulate the band gap of Ta2NiSe5 with light on the femtosecond time scale.

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Language(s): eng - English
 Dates: 2016-08-192017-02-102017-08-232017-08-25
 Publication Status: Issued
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 1608.05586
URI: http://arxiv.org/abs/1608.05586
DOI: 10.1103/PhysRevLett.119.086401
 Degree: -

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Project name : DYNCORSYS - Real-time dynamics of correlated many-body systems
Grant ID : 278023
Funding program : Funding Programme 7 (FP7)
Funding organization : European Commission (EC)

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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: 5 Volume / Issue: 119 (8) Sequence Number: 086401 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1