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  Inhibition of the photoinduced structural phase transition in the excitonic insulator Ta2NiSe5

Mor, S., Herzog, M., Noack, J., Katayam, N., Nohara, M., Takagi, H., et al. (2018). Inhibition of the photoinduced structural phase transition in the excitonic insulator Ta2NiSe5. Physical Review B, 97(11): 115154. doi:10.1103/PhysRevB.97.115154.

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PhysRevB.97.115154.pdf (Verlagsversion), 463KB
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PhysRevB.97.115154.pdf
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2018
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APS
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 Urheber:
Mor, Selene1, Autor           
Herzog, Marc1, 2, Autor           
Noack, Johannes3, Autor           
Katayam, Naoyuki4, Autor
Nohara, Minoru5, Autor
Takagi, Hide6, 7, Autor
Trunschke, Annette3, Autor           
Mizokawa, Takashi8, Autor
Monney, Claude9, Autor
Stähler, Julia1, Autor           
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              
3Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
4Department of Physical Science and Engineering, Nagoya University, 464-8603 Nagoya, Japan, ou_persistent22              
5Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan, ou_persistent22              
6Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany, ou_persistent22              
7Department of Physics, University of Tokyo, 113-8654 Tokyo, Japan, ou_persistent22              
8Department of Applied Physics, Waseda University, Tokyo 169-8555, Japan, ou_persistent22              
9Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland, ou_persistent22              

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 Zusammenfassung: Femtosecond time-resolved midinfrared reflectivity is used to investigate the electron and phonon dynamics occurring at the direct band gap of the excitonic insulator Ta2NiSe5 below the critical temperature of its structural phase transition. We find that the phonon dynamics show a strong coupling to the excitation of free carriers at the Γ point of the Brillouin zone. The optical response saturates at a critical excitation fluence FC=0.30±0.08 mJ/cm2 due to optical absorption saturation. This limits the optical excitation density in Ta2NiSe5 so that the system cannot be pumped sufficiently strongly to undergo the structural change to the high-temperature phase. We thereby demonstrate that Ta2NiSe5 exhibits a blocking mechanism when pumped in the near-infrared regime, preventing a nonthermal structural phase transition.

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Sprache(n): eng - English
 Datum: 2018-02-072017-11-242018-03-262018-03-15
 Publikationsstatus: Erschienen
 Seiten: 5
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1103/PhysRevB.97.115154
 Art des Abschluß: -

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Titel: Physical Review B
  Kurztitel : Phys. Rev. B
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Woodbury, NY : American Physical Society
Seiten: 5 Band / Heft: 97 (11) Artikelnummer: 115154 Start- / Endseite: - Identifikator: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008