Charge-Transfer Excitations in One-Dimensional Dimerized Mott Insulators

Details Charge-Transfer Excitations in One-Dimensional Dimerized Mott Insulators Charge-Transfer Excitations in One-Dimensional Dimerized Mott Insulators

2007-05-16

arxiv.org/abs/0705.2303v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 6 figures, to be published in J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.76.074713

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.

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