Photoexcited States in Dimer Mott Insulators \kappa-(BEDT-TTF)2X
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概要
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We theoretically investigate the physical properties of photoexcited states in dimer Mott insulators of the form \kappa-(BEDT-TTF)2X. We adopt the quarter-filled extended Hubbard Hamiltonian on a two-dimensional anisotropic triangular lattice. The energy eigenstates responsible for the major peaks in the light absorption spectrum are numerically calculated, and their physical properties are investigated. Inter dimer charge transfer excited states form quite a broad band, and the large bandwidth mainly arises from the distribution of the kinetic energy of the photogenerated doublon and holon. The band of intra dimer photoexcited states is much narrower because of the isolated nature of the excitation. As a result, the main optical components in the lower-energy region in the light absorption spectrum are due to inter dimer charge transfer excitations, and those in the higher-energy region are due to excitations to the energy eigenstates where inter dimer charge transfer and intra dimer excited states are hybridized. In the induced light absorption spectrum from inter dimer charge transfer excited states, charge excitations exist in the Mott gap energy region of the ground state. However, these excitations are due to the scattering of the photogenerated doublon and holon, and the Mott gap is retained in these excited states. There are in-gap charge excitations also in intra dimer excited states. These excitations are associated with charge fluctuations induced by the transfer motion of intra dimer excitation, therefore, the Mott gap is also retained in these excited states.
- 2012-03-15
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 Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
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Hirao Yoshihiro
Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, 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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