Ultrafast insulator-metal transition in VO2 : interplay between coherent lattice motion and electronic correlations

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2009
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Lopez, Rene
Halabica, Andrej
Haglund, Richard F.
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Physica Status Solidi (C) - Current Topics in Solid State Physics. Wiley-Blackwell. 2009, 6(1), pp. 149-151. ISSN 1862-6351. eISSN 1610-1642. Available under: doi: 10.1002/pssc.200879860
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The multi-THz conductivity of VO2 recorded during a photoinduced insulator-metal transition directly reveals the femtosecond dynamics of V-V stretching modes and electronic correlations. The strongly correlated character of the electronic system leads to a transient behaviour of the conductivity that cannot be understood in a Born-Oppenheimer picture. Based on our measurements with a time resolution of 12 fs and recent theoretical simulations for the electronic structure in steady state, we suggest a novel qualitative model for the non-thermal phase transition. The extremely high speed for the photoinduced phase transition is elegantly explained via a directed wave packet motion in the electronically excited state of the dimer that transfers the crystal structure of the insulator into the configuration of the metallic phase.

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ISO 690LEITENSTORFER, Alfred, Carl KÜBLER, Rene LOPEZ, Andrej HALABICA, Richard F. HAGLUND, Rupert HUBER, 2009. Ultrafast insulator-metal transition in VO2 : interplay between coherent lattice motion and electronic correlations. In: Physica Status Solidi (C) - Current Topics in Solid State Physics. Wiley-Blackwell. 2009, 6(1), pp. 149-151. ISSN 1862-6351. eISSN 1610-1642. Available under: doi: 10.1002/pssc.200879860
BibTex
@article{Leitenstorfer2009Ultra-58370,
  year={2009},
  doi={10.1002/pssc.200879860},
  title={Ultrafast insulator-metal transition in VO<sub>2</sub> : interplay between coherent lattice motion and electronic correlations},
  number={1},
  volume={6},
  issn={1862-6351},
  journal={Physica Status Solidi (C) - Current Topics in Solid State Physics},
  pages={149--151},
  author={Leitenstorfer, Alfred and Kübler, Carl and Lopez, Rene and Halabica, Andrej and Haglund, Richard F. and Huber, Rupert}
}
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