Dynamics of photoexcited states in one-dimensional dimerized Mott insulators

Abstract

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).

13 pages, 13 figures, accepted for publication in PRB

References in corpus (1)

• 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

Cited by in corpus (6)

• Photoinduced melting of charge order in a quarter-filled electron system coupled with different types of phonons
• Coupling-dependent rates of energy transfers from photoexcited Mott insulators to lattice vibrations
• Photoinduced charge and spin dynamics in strongly correlated electron systems
• Polaronic states with Spin-Charge-Coupled Excitation in a 1D Mott Insulator K-TCNQ
• Photoexcitation of electronic instabilities in one-dimensional charge-transfer systems
• Charge-Transfer Excitations in One-Dimensional Dimerized Mott Insulators