Role of electron-electron and electron-phonon interaction effect in the optical conductivity of VO2
K. Okazaki, S. Sugai, Y. Muraoka, Z. Hiroi
Abstract
We have investigated the charge dynamics of VO2 by optical reflectivity measurements. Optical conductivity clearly shows a metal-insulator transition. In the metallic phase, a broad Drude-like structure is observed. On the other hand, in the insulating phase, a broad peak structure around 1.3 eV is observed. It is found that this broad structure observed in the insulating phase shows a temperature dependence. We attribute this to the electron-phonon interaction as in the photoemission spectra.
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