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Applying newly developed dynamical density matrix renormalization grouptechniques at zero and finite temperatures to a Hubbard-Holstein model athalf-filling, we examine the optical conductivity of a typical one-dimensionalMott insulator Sr_2CuO_3. We find a set of parameters in the Hubbard-Holsteinmodel, which can describe optical conductivity for both Mott-gap excitation inthe high-energy region and phonon-assisted spin excitation in the low-energyregion. We also find that electron-phonon interaction gives additionalbroadening in the temperature dependence of the Mott-gap excitation.

Density matrix renormalization group study of optical conductivity in the one-dimensional Mott insulator Sr_2CuO_3