@article{Pashkin2011Ultra-17694,
  year={2011},
  doi={10.1103/PhysRevB.83.195120},
  title={Ultrafast insulator-metal phase transition in VO<sub>2</sub> studied by multiterahertz spectroscopy},
  number={19},
  volume={83},
  issn={1098-0121},
  journal={Physical Review B},
  author={Pashkin, Alexej and Kübler, Carl and Ehrke, Henri and Lopez, Ricardo and Halabica, Andrej and Haglund, Richard and Huber, Rupert and Leitenstorfer, Alfred}
}

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    <dc:creator>Ehrke, Henri</dc:creator>
    <dc:creator>Pashkin, Alexej</dc:creator>
    <dcterms:bibliographicCitation>First publ. in: Physical Review B ; 83 (2011), 19. - 195120</dcterms:bibliographicCitation>
    <dc:contributor>Lopez, Ricardo</dc:contributor>
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    <dc:contributor>Ehrke, Henri</dc:contributor>
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    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2012-02-29T10:29:15Z</dc:date>
    <dc:contributor>Haglund, Richard</dc:contributor>
    <dc:creator>Lopez, Ricardo</dc:creator>
    <dcterms:title>Ultrafast insulator-metal phase transition in VO&lt;sub&gt;2&lt;/sub&gt; studied by multiterahertz spectroscopy</dcterms:title>
    <dc:creator>Halabica, Andrej</dc:creator>
    <dc:contributor>Huber, Rupert</dc:contributor>
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    <dc:creator>Haglund, Richard</dc:creator>
    <dc:contributor>Leitenstorfer, Alfred</dc:contributor>
    <dc:creator>Leitenstorfer, Alfred</dc:creator>
    <dc:contributor>Halabica, Andrej</dc:contributor>
    <dc:language>eng</dc:language>
    <dc:creator>Kübler, Carl</dc:creator>
    <dc:contributor>Kübler, Carl</dc:contributor>
    <dc:creator>Huber, Rupert</dc:creator>
    <dcterms:abstract xml:lang="eng">The ultrafast photoinduced insulator-metal transition in VO2 is studied at different temperatures and excitation fluences using multi-THz probe pulses. The spectrally resolved midinfrared response allows us to trace separately the dynamics of lattice and electronic degrees of freedom with a time resolution of 40 fs. The critical fluence of the optical pump pulse, which drives the system into a long-lived metallic state, is found to increase with decreasing temperature. Under all measurement conditions, we observe a modulation of the eigenfrequencies of the optical phonon modes induced by their anharmonic coupling to the coherent wave-packet motion of V-V dimers at 6.1 THz. Furthermore, we find a weak quadratic coupling of the electronic response to the coherent dimer oscillation resulting in a modulation of the electronic conductivity at twice the frequency of the wave-packet motion. The findings are discussed in the framework of a qualitative model based on an approximation of local photoexcitation of the vanadium dimers from the insulating state.</dcterms:abstract>
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