Dynamics of photoexcited states in one-dimensional dimerized Mott insulators

Details Dynamics of photoexcited states in one-dimensional dimerized Mott insulators Dynamics of photoexcited states in one-dimensional dimerized Mott insulators

2006-09-08

arxiv.org/abs/cond-mat/0609186v1

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 13 figures, accepted for publication in PRB

Scientific paper

10.1103/PhysRevB.74.155105

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).

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