Excitonic optical spectra and energy structures in a one-dimensional Mott insulator demonstrated by applying a many-body Wannier functions method to a charge model

Abstract

We have applied a many-body Wannier functions method to theoretically calculate an excitonic optical conductivity spectrum and energy structure in a one-dimensional (1D) Mott insulator at absolute zero temperature with large system size. Focusing on full charge fluctuations associated with pairs of a holon and doublon, we employ a charge model, which is interpreted as a good effective model to investigate photoexcitations of a 1D extended Hubbard model at half-filling in the spin-charge separation picture. As a result, the theoretical spectra with appropriate broadenings qualitatively reproduce the recent experimental data of ET-F${}_2$TCNQ at 294 K with and without a modulated electric field. Regarding the excitonic energy structure, we have found that the excitons, especially for even-parity, are weakly bound by many-body effects. This is also consistent with the fitting parameters reported in the recent experiment. Thus, our theoretical method presented in this paper is practically useful to understand physical roles of charge fluctuations in many-body excited states of a 1D Mott insulator.

arXiv comment31 pages, 9 figures

References in corpus (29)

• The density-matrix renormalization group
• Correlated Electrons in High Temperature Superconductors
• Real time evolution using the density matrix renormalization group
• Electrodynamics of Correlated Electron Materials
• Dynamical density-matrix renormalization-group method
• Quantum interference between charge excitation paths in a solid state Mott insulator
• Spectral function of the one-dimensional Hubbard model away from half filling
• Selected configuration interaction dressed by perturbation
• Non-linear doublon production in a Mott insulator --- Landau-Dykhne method applied to an integrable model
• Photoinduced $\eta$ Pairing in the Hubbard Model
• Nonlinear optical response and spin-charge separation in one-dimensional Mott insulators
• Photo-induced states in a Mott insulator
• Optical conductivity of the half-filled Hubbard chain
• Excitons in one-dimensional Mott insulators
• Spectral functions of the 1D Hubbard model in the U -> \infty limit: How to use the factorized wave-function
• THz-Frequency Modulation of the Hubbard U in an Organic Mott Insulator
• Optical excitations in a one-dimensional Mott insulator
• Combining configuration interaction with perturbation theory for atoms with large number of valence electrons
• Pressure dependent relaxation in the photo-excited Mott insulator ETF2TCNQ: Influence of hopping and correlations on quasiparticle recombination rates
• Excitons in the One-Dimensional Hubbard Model: a Real-Time Study
• Dynamical density-density correlations in one-dimensional Mott insulators
• Spin and charge dynamics of the one-dimensional extended Hubbard model
• Photo-induced Tomonaga-Luttinger-like liquid in a Mott insulator
• Optical response in one dimensional Mott Insulators
• New Types of Off-Diagonal Long Range Order in Spin-Chains
• Exciton Recombination in One-Dimensional Organic Mott Insulators
• Biexciton in one-dimensional Mott insulators
• Optical conductivity of the Hubbard chain away from half filling
• A charge model as an effective model of one-dimensional Hubbard and extended Hubbard systems: its application to linear optical spectrum calculations in large systems based upon many-body Wannier functions

Cited by in corpus (6)

• Theoretical methods for excitonic physics in two-dimensional materials
• Glassy dynamics of the one-dimensional Mott insulator excited by a strong terahertz pulse
• Wannier-Stark ladders and Stark shifts of excitons in Mott insulators
• Pump-probe spectroscopy of the one-dimensional extended Hubbard model at half filling
• Keldysh crossover in one-dimensional Mott insulators
• Controlling inversion and time-reversal symmetries by subcycle pulses in the one-dimensional extended Hubbard model