Charge, Lattice, and Spin Dynamics in Photoinduced Phase Transitions from Charge-Ordered Insulator to Metal in Quasi-Two-Dimensional Organic Conductors
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概要
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To elucidate the different photoinduced melting dynamics of charge orders observed in the quasi-two-dimensional organic conductors $\theta$-(BEDT-TTF)2RbZn(SCN)4 and $\alpha$-(BEDT-TTF)2I3 [BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene], we theoretically study the photoinduced time evolution of charge and spin correlation functions on the basis of exact many-electron wave functions coupled with classical phonons in extended Peierls–Hubbard models on anisotropic triangular lattices. In both salts, the so-called horizontal-stripe charge order is stabilized by nearest-neighbor repulsive interactions and electron–lattice interactions. In $\theta$-(BEDT-TTF)2RbZn(SCN)4 (abbreviated as $\theta$-RbZn), the stabilization energy due to lattice distortion is larger, so that a larger quantity of energy needs to be absorbed to melt charge and lattice orders. The photoinduced charge dynamics shows a complex behavior owing to a substantial number of nearly degenerate eigenstates involved. This is related to the high structural symmetry when the lattice is undistorted. In $\alpha$-(BEDT-TTF)2I3 (abbreviated as $\alpha$-I3), the lattice stabilization energy is smaller, and a small quantity of energy is sufficient to melt charge and lattice orders leading to a metallic phase. The photoinduced charge dynamics shows a sinusoidal oscillation. In $\alpha$-I3, the low structural symmetry ensures nearly spin-singlet bonds between hole-rich sites, where the spin correlation survives even after photoexcitation.
- Physical Society of Japanの論文
- 2010-03-15
著者
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YONEMITSU Kenji
Institute for Molecular Science
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Miyashita Satoshi
Institute For Materials Research Tohoku University:institute For Molecular Science
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TANAKA Yasuhiro
Institute for Molecular Science
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Iwai Shinichiro
Department Of Physics Faculty Of Science Tohoku University:nanostructure And Material Property Group
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Iwai Shinichiro
Department of Physics, Tohoku University, Sendai 980-8578, Japan
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