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).

arXiv comment13 pages, 13 figures, accepted for publication in PRB

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• Theory of Photoinduced Phase Transitions
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• Polaronic states with Spin-Charge-Coupled Excitation in a 1D Mott Insulator K-TCNQ
• Photoexcitation of electronic instabilities in one-dimensional charge-transfer systems
• Time-dependent spectral properties of photoexcited one-dimensional ionic Hubbard model: an exact diagonalization study
• Charge-Transfer Excitations in One-Dimensional Dimerized Mott Insulators
• Optical absorption preceding resonant double photoionization of aromatic hydrocarbons hydrocarbons