Photogenerated Metallic States in Charge-Ordered Insulators in (BEDT-TTF)2X
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概要
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We theoretically investigate the physical properties of the photoexcited states in the charge-ordered states in \alpha-(BEDT-TTF)2I3 and \theta-(BEDT-TTF)2RbZn(SCN)4. We adopt the 1/4-filled extended Hubbard Hamiltonian for holes on the two-dimensional anisotropic triangular lattice. The photoexcited states are numerically calculated by solving the time-dependent Schrödinger equation subject to pump light. In the lower-energy region of pump light photons, an extremely small number of energy eigenstates dominate the transition moment from the ground state. These energy eigenstates are collective excited states that have the charge order, and they are insulating as a result of the charge order. In the higher-energy region, the density of energy eigenstates that contribute to the light absorption spectrum, is much larger than that in the lower-energy region, and these energy eigenstates are metallic and have no charge order. The present results show that the metallic states are directly generated in the early stage of photoinduced phase transition from a charge-ordered insulator to a metal, which is consistent with experimental results.
- 2011-03-15
著者
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Aihara Masaki
Graduate School Of Materials Science Nara Institute Of Science And Technology
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Takahashi Akira
Graduate School Of Materials Science Nara Institute Of Science And Technology
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Gomi Hiroki
Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
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Gomi Hiroki
Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
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Lee JaeDong
School of Materials Science, Japan Advanced Institute of Science and Technology, Nomi, Ishikawa 923-1292, Japan
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Tatsumi Tokio
Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
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Kobayashi Seiji
Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
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Miyamoto Kengo
Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
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