Polaronic states with Spin-Charge-Coupled Excitation in a 1D Mott Insulator K-TCNQ

Details Polaronic states with Spin-Charge-Coupled Excitation in a 1D Mott Insulator K-TCNQ Polaronic states with Spin-Charge-Coupled Excitation in a 1D Mott Insulator K-TCNQ

2008-05-19

arxiv.org/abs/0805.2787v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 8 figures, to appear in J. Phys. Soc. Jpn. Vol.77, No.7 (2008)

Scientific paper

10.1143/JPSJ.77.074713

We discuss photogenerated midgap states of a one-dimensional (1D) dimerized Mott insulator, potassium-tetracyanoquinodimethane (K-TCNQ). Two types of phonon modes are taken into account: intermolecular and intramolecular vibrations. We treat these phonon modes adiabatically and analyze a theoretical model by using the density-matrix renormalization group (DMRG). Our numerical results demonstrate that the intermolecular lattice distortion is necessary to reproduce the photoinduced midgap absorption in K-TCNQ. We find two types of midgap states. One is a usual polaronic state characterized by a localized elementary excitation. The other is superposition of two types of excitations, a doped-carrier state and a triplet-dimer state, which can be generally observed in 1D dimerized Mott insulators, not limited to K-TCNQ.

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