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A symmetrized Density Matrix Renormalization Group procedure together with the correction vector approach is shown to be highly accurate for obtaining dynamic linear and third order polarizabilities of one-dimensional Hubbard and U-V models. The U-V model is seen to show characteristically different third harmonic generation response in the CDW and SDW phases. This can be rationalized from the excitation...
Using a symmetrized density matrix renormalization group formulation, we have investigated the electronic binding energy (E b ) of the lowest optically allowed exciton (1B) and the crossover behavior of the 1B/2A states within an extended Hubbard-Peierls model (with parameters U, V, and δ) for conjugated polymer chains with N = 80. The E b value is found to be around 0.1 eV for polyacetylene...
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