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- W2146211162 abstract "We present a detailed infrared study of the insulator-to-metal transition IMT in vanadium dioxide VO2 thin films. Conventional infrared spectroscopy was employed to investigate the IMT in the far field. Scanning near-field infrared microscopy directly revealed the percolative IMT with increasing temperature. We confirmed that the phase transition is also percolative with cooling across the IMT. We present extensive near-field infrared images of phase coexistence in the IMT regime in VO2. We find that the coexisting insulating and metallic regions at a fixed temperature are static on the time scale of our measurements. A distinctive approach for analyzing the far-field and near-field infrared data within the Bruggeman effective medium theory was employed to extract the optical constants of the incipient metallic puddles at the onset of the IMT. We found divergent effective carrier mass in the metallic puddles that demonstrates the importance of electronic correlations to the IMT in VO2. We employ the extended dipole model for a quantitative analysis of the observed near-field infrared amplitude contrast and compare the results with those obtained with the basic dipole model." @default.
- W2146211162 created "2016-06-24" @default.
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- W2146211162 date "2009-02-10" @default.
- W2146211162 modified "2023-09-28" @default.
- W2146211162 title "Infrared spectroscopy and nano-imaging of the insulator-to-metal transition in vanadium dioxide" @default.
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- W2146211162 doi "https://doi.org/10.1103/physrevb.79.075107" @default.
- W2146211162 hasPublicationYear "2009" @default.
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