Abstract
We theoretically investigate the physical properties of the photoexcited states in the charge-ordered states in α-(BEDT-TTF) 2 I 3 and θ-(BEDT-TTF) 2 RbZn(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 Schrodinger 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 s...
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