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Evidence for a structurally-driven insulator-to-metal transition in VO2 : a view from the ultrafast timescale

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2004

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Cavalleri, Andrea
Chong, Henry H. W.
Kieffer, Jean-Claude
Schoenlein, Robert W.

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Physical Review B. 2004, 70(16), 161102. Available under: doi: 10.1103/PhysRevB.70.161102

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We apply ultrafast spectroscopy to establish a time-domain hierarchy between structural and electronic effects in a strongly correlated electron system. We discuss the case of the model system VO2 , a prototypical nonmagnetic compound that exhibits cell doubling, charge localization, and a metal-insulator transition below 340 K. We initiate the formation of the metallic phase by prompt hole photo-doping into the valence band of the low- T insulator. The insulator-to-metal transition is, however, delayed with respect to hole injection, exhibiting a bottleneck time scale, associated with the phonon connecting the two crystallographic phases. This structural bottleneck is observed despite faster depletion of the d bands and is indicative of important bandlike character for this controversial insulator.

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530 Physik

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ISO 690CAVALLERI, Andrea, Thomas DEKORSY, Henry H. W. CHONG, Jean-Claude KIEFFER, Robert W. SCHOENLEIN, 2004. Evidence for a structurally-driven insulator-to-metal transition in VO2 : a view from the ultrafast timescale. In: Physical Review B. 2004, 70(16), 161102. Available under: doi: 10.1103/PhysRevB.70.161102
BibTex
@article{Cavalleri2004Evide-5099,
  year={2004},
  doi={10.1103/PhysRevB.70.161102},
  title={Evidence for a structurally-driven insulator-to-metal transition in VO2 : a view from the ultrafast timescale},
  number={16},
  volume={70},
  journal={Physical Review B},
  author={Cavalleri, Andrea and Dekorsy, Thomas and Chong, Henry H. W. and Kieffer, Jean-Claude and Schoenlein, Robert W.},
  note={Article Number: 161102}
}
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