Publikation: Coherent structural dynamics and electronic correlations during an ultrafast insulator-to-metal phase transition in VO2
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2007
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Physical Review Letters. 2007, 99(11). ISSN 0031-9007. Available under: doi: 10.1103/PhysRevLett.99.116401
Zusammenfassung
We directly trace the multi-THz conductivity of VO2 during an insulator-metal transition triggered by a 12-fs light pulse. The femtosecond dynamics of lattice and electronic degrees of freedom are spectrally discriminated. A coherent wave packet motion of V-V dimers at 6 THz modulates the lattice polarizability for approximately 1 ps. In contrast, the electronic conductivity settles to a constant value already after one V-V oscillation cycle. Based on our findings, we propose a qualitative model for the nonthermal phase transition.
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KÜBLER, Carl, Henri EHRKE, Rene LOPEZ, Andrej HALABICA, Richard F. HAGLUND, Alfred LEITENSTORFER, 2007. Coherent structural dynamics and electronic correlations during an ultrafast insulator-to-metal phase transition in VO2. In: Physical Review Letters. 2007, 99(11). ISSN 0031-9007. Available under: doi: 10.1103/PhysRevLett.99.116401BibTex
@article{Kubler2007Coher-16693,
year={2007},
doi={10.1103/PhysRevLett.99.116401},
title={Coherent structural dynamics and electronic correlations during an ultrafast insulator-to-metal phase transition in VO2},
number={11},
volume={99},
issn={0031-9007},
journal={Physical Review Letters},
author={Kübler, Carl and Ehrke, Henri and Lopez, Rene and Halabica, Andrej and Haglund, Richard F. and Leitenstorfer, Alfred}
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<dcterms:bibliographicCitation>Publ. in: Physical Review Letters ; 99 (2007), 11. - S. 116401</dcterms:bibliographicCitation>
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<dcterms:abstract xml:lang="eng">We directly trace the multi-THz conductivity of VO2 during an insulator-metal transition triggered by a 12-fs light pulse. The femtosecond dynamics of lattice and electronic degrees of freedom are spectrally discriminated. A coherent wave packet motion of V-V dimers at 6 THz modulates the lattice polarizability for approximately 1 ps. In contrast, the electronic conductivity settles to a constant value already after one V-V oscillation cycle. Based on our findings, we propose a qualitative model for the nonthermal phase transition.</dcterms:abstract>
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