Absence of Transition in Photoexcited States across the One-Dimensional CDW–SDW Phase Boundary

概要

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We theoretically investigate how the photoexcited states change across the phase boundary between the charge density wave (CDW) and the spin density wave (SDW) states in the one-dimensional (1D) and the two-dimensional (2D) Pariser–Parr–Pople models in the strong interaction case. In the 1D case, the CDW (singlet spin pair) droplet states dominate light absorption spectrum in the SDW (CDW) ground state region near the phase boundary. These photoexcited states exhibit crossover behavior across the phase boundary, that is, the density of the CDW region gradually increases across the phase boundary from the SDW to the CDW ground state region. On the contrary, in the 2D case, the bound holon–doublon (singlet spin) pair state dominates the light absorption spectrum, and the quantum fluctuations of the CDW or the singlet spin pair domain are negligible in the dominant photoexcited state even near the phase boundary. As a result, the transition occurs in the dominant photoexcited state at the ground state phase boundary.
Physical Society of Japanの論文
2009-04-15