Photoinduced Metallic Properties of One-Dimensional Strongly Correlated Electron Systems

  • Maeshima Nobuya
    Department of Chemistry, Tohoku University Institute for Molecular Science
  • Yonemitsu Kenji
    Institute for Molecular Science Graduate University for Advanced Studies

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Abstract

We study photoinduced optical responses of one-dimensional strongly correlated electron systems. Optical conductivity spectra are calculated for the ground and photoexcited states in a one-dimensional Hubbard model at half filling by the exact diagonalization method. It is found that, in the Mott insulator phase, the photoexcited state has large spectral weights including the Drude weight below the optical gap. As a consequence, the spectral weight above the optical gap is markedly reduced. These results imply that a metallic state is induced by photoexcitation. A comparison between the photoexcited and hole-doped states shows that photoexcitation is similar to chemical doping.

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