Photoinduced metallic properties of one-dimensional strongly correlated electron systems

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 in...

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Published in:Journal of the Physical Society of Japan 2005-10, Vol.74 (10), p.2671-2674
Main Authors: MAESHIMA, Nobuya, YONEMITSU, Kenji
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Exact sciences and technology
Metal-insulator transitions and other electronic transitions
Physics
Strongly correlated systems
heavy fermions
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description 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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subjects Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Exact sciences and technology
Metal-insulator transitions and other electronic transitions
Physics
Strongly correlated systems
heavy fermions
title Photoinduced metallic properties of one-dimensional strongly correlated electron systems
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