Charge-Transfer Excitations in One-Dimensional Dimerized Mott Insulators

Abstract

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.

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

References in corpus (7)

• Nonlinear optical response and spin-charge separation in one-dimensional Mott insulators
• Optical absorption of strongly correlated half-filled Mott-Hubbard chains
• Photoinduced metallic properties of one-dimensional strongly correlated electron systems
• Theory of Photoinduced Phase Transitions
• Exact results for the optical absorption of strongly correlated electrons in a half-filled Peierls-distorted chain
• Interchain coupling effects on photoinduced phase transitions between neutral and ionic phases in an extended Hubbard model with alternating potentials and an electron-lattice coupling
• Dynamics of photoexcited states in one-dimensional dimerized Mott insulators

Cited by in corpus (4)

• Coupling-dependent rates of energy transfers from photoexcited Mott insulators to lattice vibrations
• Photoinduced charge-order melting dynamics in a one-dimensional interacting Holstein model
• Polaronic states with Spin-Charge-Coupled Excitation in a 1D Mott Insulator K-TCNQ
• Photoexcitation of electronic instabilities in one-dimensional charge-transfer systems