Dynamics of photoexcited states in one-dimensional dimerized Mott insulators

被引：14
|
作者：
Maeshima, Nobuya [1 ]
Yonemitsu, Kenji
机构：
[1] Tohoku Univ, Dept Chem, Aoba Ku, Sendai, Miyagi 9808578, Japan
[2] Inst Mol Sci, Okazaki, Aichi 4448585, Japan
[3] Grad Univ Adv Studies, Dept Funct Mol Sci, Okazaki, Aichi 4448585, Japan
来源：
PHYSICAL REVIEW B | 2006年 / 74卷 / 15期
关键词：
D O I：
10.1103/PhysRevB.74.155105
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Dynamical properties of photoexcited states are theoretically studied in a one-dimensional Mott insulator dimerized by the spin-Peierls instability. Numerical calculations combined with a perturbative analysis have revealed that the lowest photoexcited state without nearest-neighbor interaction corresponds to an interdimer charge transfer excitation that belongs to dispersive excitations. This excited state destabilizes the dimerized phase, leading to a photoinduced inverse spin-Peierls transition. We discuss the purely electronic origin of midgap states that are observed in a latest photoexcitation experiment of an organic spin-Peierls compound, K-TCNQ (potassium-tetracyanoquinodimethane).
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页数：11
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