Optical Susceptibilities of Polymers: Current-Current versus Dipole-Dipole Correlation

Details Optical Susceptibilities of Polymers: Current-Current versus Dipole-Dipole Correlation Optical Susceptibilities of Polymers: Current-Current versus Dipole-Dipole Correlation

1999-05-27

arxiv.org/abs/cond-mat/9905406v1

Phys. Lett. A Vol. 257, 215 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1016/S0375-9601(99)00288-1

The static current operator leads to definitional zero frequency divergence and unphysical results in studying nonlinear optical susceptibilities of polymers. A well-defined dipole-dipole correlation is superior to the complicated current-current correlation to solve this problem. As illustrative examples, optical susceptibilities under both SSH and TLM models of trans-(CH)_x are studied. New analytical results are obtained. The reasons of previous improper results are analyzed.

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