LOW-LYING ELECTRONIC EXCITATIONS AND NONLINEAR OPTIC PROPERTIES OF POLYMERS VIA SYMMETRIZED DENSITY MATRIX RENORMALIZATION GROUP METHOD

摘要

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 spectrum of the systems. [References: 19]