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  Tracking the evolution of electronic and structural properties of VO2 during the ultrafast photoinduced insulator-metal transition

Wall, S., Foglia, L., Wegkamp, D., Appavoo, K., Nag, J., Haglund, R. F., et al. (2013). Tracking the evolution of electronic and structural properties of VO2 during the ultrafast photoinduced insulator-metal transition. Physical Review B, 87(11): 115126. doi:10.1103/PhysRevB.87.115126.

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PhysRevB.87.115126.pdf (Verlagsversion), 2MB
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2013
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APS
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 Urheber:
Wall, Simon1, 2, Autor           
Foglia, Laura1, Autor           
Wegkamp, Daniel1, Autor           
Appavoo, K.3, Autor
Nag, J.3, Autor
Haglund, R. F.3, Autor
Stähler, Julia1, Autor           
Wolf, Martin1, Autor           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2ICFO-Institut de Ciencies Fotoniques, Av. Carl Friedrich Gauss, 3, 08860 Castelldefels, Barcelona, Spain, ou_persistent22              
3Department of Physics and Astronomy, Vanderbilt University,, Nashville, Tennessee 37235-1807, USA, ou_persistent22              

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 Zusammenfassung: We present a detailed study of the photoinduced insulator-metal transition in VO2 with broadband time-resolved reflection spectroscopy. This allows us to separate the response of the lattice vibrations from the electronic dynamics and observe their individual evolution. When we excite VO2 above the photoinduced phase transition threshold, we find that the restoring forces that describe the ground-state monoclinic structure are lost during the excitation process, suggesting that an ultrafast change in the lattice potential drives the structural transition. However, by performing a series of pump-probe measurements during the nonequilibrium transition, we observe that the electronic properties of the material evolve on a different, slower time scale. This separation of time scales suggests that the early state of VO2, immediately after photoexcitation, is a nonequilibrium state that is not well defined by either the insulating or the metallic phase.

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Sprache(n): eng - English
 Datum: 2012-05-292013-01-102013-03-202013-03-20
 Publikationsstatus: Erschienen
 Seiten: 12
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1103/PhysRevB.87.115126
 Art des Abschluß: -

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Titel: Physical Review B
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Woodbury, NY : Published by the American Physical Society through the American Institute of Physics
Seiten: - Band / Heft: 87 (11) Artikelnummer: 115126 Start- / Endseite: - Identifikator: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008