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- W2080477427 abstract "The light-induced insulator-to-metal phase transition was investigated by femtosecond pump-probe techniques in nanocrystalline ${text{VO}}_{2}$ films. The size of ${text{VO}}_{2}$ nanoparticles and the ${text{VO}}_{2}$ film morphology were found to be critical for the ultrafast light-induced phase-transition dynamics. Experimental measurements of the third-order nonlinear susceptibility ${ensuremath{chi}}^{(3)}$ for the insulating phase at different excitation levels and transient grating experiments show a size-dependent threshold behavior which is related to the light-induced transition process. Optical properties of ${text{VO}}_{2}$ nanoparticles, $|{ensuremath{chi}}^{(3)}|$ data, and transition dynamics at subnanosecond time scale also demonstrate a pronounced size dependence. The rate of structural phase transition increases due to confinement effect as particle size decreases. Nucleation of the metallic phase shows a critical behavior with formation of a metastable state in ${text{VO}}_{2}$. A kinetic model for the metallic phase growth and transient grating signal evolution upon ultrafast laser excitation is developed for ${text{VO}}_{2}$ thin film." @default.
- W2080477427 created "2016-06-24" @default.
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- W2080477427 date "2010-11-17" @default.
- W2080477427 modified "2023-10-01" @default.
- W2080477427 title "Critical behavior and size effects in light-induced transition of nanostructured<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>VO</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>films" @default.
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- W2080477427 doi "https://doi.org/10.1103/physrevb.82.205425" @default.
- W2080477427 hasPublicationYear "2010" @default.
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