Comment on ``Density-matrix renormalization-group method for excited states''

Details Comment on ``Density-matrix renormalization-group method for excited states'' Comment on ``Density-matrix renormalization-group method for excited states''

2001-03-08

arxiv.org/abs/cond-mat/0103186v2

Physical Review B 63, pp. 157101 (2001)

Physics

Condensed Matter

RevTeX, 10 pages, 4 eps figures fixed and included now in text

Scientific paper

10.1103/PhysRevB.63.157101

In a Physical Review B paper Chandross and Hicks claim that an analysis of the density-density correlation function in the dimerised Hubbard model of polyacetylene indicates that the optical exciton is bound, and that a previous study by Boman and Bursill that concluded otherwise was incorrect due to numerical innacuracy. We show that the method used in our original paper was numerically sound and well established in the literature. We also show that, when the scaling with lattice size is analysed, the interpretation of the density-density correlation function adopted by Chandross and Hicks in fact implies that the optical exciton is unbound.

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