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arXiv 0705.2303cond-mat.str-el
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一维二聚莫特绝缘体中的电荷转移激发

Charge-Transfer Excitations in One-Dimensional Dimerized Mott Insulators

Nobuya Maeshima, Kenji Yonemitsu

摘要:

利用一维二聚扩展哈伯德模型研究了一维二聚莫特绝缘体的光学性质。数值计算和微扰分析从双聚体的限制澄清,有三个相关的类的电荷转移(CT)状态产生的光激发:interdimer CT未结合状态,interdimer CT激子状态,和intradimer CT激子状态。这种分类适用于理解的有机分子材料,1,3,5-三硫杂-2,4,6-三氮杂并环戊二烯基(TTTA),这是已知的光诱导从二聚自旋单重态相的顺磁相的转变的光学性质。结果表明,TTTA的最低光激发态是二聚体间CT激子态,次低光激发态是二聚体内CT激子态。

英文摘要:

We investigate the optical properties of one-dimensional (1D) dimerized Mott insulators using the 1D dimerized extended Hubbard model. Numerical calculations and a perturbative analysis from the decoupled-dimer limit clarify that there are three relevant classes of charge-transfer (CT) states generated by photoexcitation: interdimer CT unbound states, interdimer CT exciton states, and intradimer CT exciton states. This classification is applied to understanding the optical properties of an organic molecular material, 1,3,5-trithia-2,4,6-triazapentalenyl (TTTA), which is known for its photoinduced transition from the dimerized spin-singlet phase to the regular paramagnetic phase. We conclude that the lowest photoexcited state of TTTA is the interdimer CT exciton state and the second lowest state is the intradimer CT exciton state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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