Excitonic effect on optical response in one-dimensional two-band Hubbard model

Abstract

Motivated by the gigantic nonlinear optical response in the halogen-bridged Ni-compounds, the underlying electronic states of the compounds are examined in the one-dimensional two-band Hubbard model, by studying the current-current correlation function and the charge density in the ground state. The dynamical density matrix renormalization group method is employed. We find that the low-energy peak of the correlation function consists of a single Lorentzian component for a parameter range appropriate to the compounds. This is due to an excitonic state induced by the intersite Coulomb repulsion between holes on the metal and halogen ions. This is consistent with the optical absorption spectra of the compounds. We suggest that the localization of holes on the metal ions in the ground state brings about the formation of the excitonic state.

4 pages, 4 figures. submitted to Phys. Rev. B

References in corpus (13)

• Dynamical density-matrix renormalization-group method
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• Excitons in one-dimensional Mott insulators
• Optical conductivity of the half-filled Hubbard chain
• Optical excitations in a one-dimensional Mott insulator
• High Energy Dynamics of the Single Impurity Anderson Model
• Dynamical density matrix renormalization group study of photoexcited states in one-dimensional Mott insulators
• Optical response in one dimensional Mott Insulators
• Angle-resolved photoemission study of MX-chain compound [Ni(chxn)${}_2$Br]Br${}_2$

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• Density matrix renormalization group study of optical conductivity in the one-dimensional Mott insulator Sr_2CuO_3
• Spin-Mediated Mott Excitons
• Enhancement of phonon effects in photoexcited states of one-dimensional Mott insulators
• Diagnosing electronic phases of matter using photonic correlation functions
• Excitonic enhancement of cavity-mediated interactions in a two-band Hubbard model
• Optical excitations in Sr${}_2$CuO${}_3$
• Photoemission Signatures of Photoinduced Carriers and Excitons in One-Dimensional Mott Insulators
• Tracking the local order parameter through the Hubbard exciton decoherence time in the Mott-Hubbard insulator LaVO3