Journal
JOURNAL OF LUMINESCENCE
Volume 129, Issue 12, Pages 1802-1805Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2009.04.091
Keywords
Terahertz pump-probe spectroscopy; Insulator-metal phase transition; Vanadium dioxide
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The ultrafast terahertz response to the photoexcitation in vanadium dioxide was investigated using the optical-pump terahertz-probe technique at room temperature The optical excitation at 790 nm induced an ultrafast decrease of the transmittance of the terahertz pulses corresponding to the increase of the electronic conductivity within 0.7 ps, and then the transmittance decreases gradually up to 100 ps. This two-step behavior is very similar to the previous reports of the time resolved X-ray and electron diffractions. This fact indicates that the increase of the electronic conductivity and the change of the lattice structure proceed in parallel, and the photo-induced insulator-metal phase transition is of the Peierls type. (C) 2009 Elsevier B.V. All rights reserved.
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