3 papers
cond-mat.str-el1999
Analytical solutions to the third-harmonic generation in trans-polyacetylene: Application of dipole-dipole correlation on the single electron models
Minzhong Xu, Xin Sun
The analytical solutions for the third-harmonic generation (THG) on infinite chains in both Su-Shrieffer-Heeger (SSH) and Takayama-Lin-Liu-Maki (TLM) models of trans-polyacetylene…
cond-mat.str-el1999
Zero frequency divergence and gauge phase factor in the optical response theory
Minzhong Xu, Xin Sun
The static current-current correlation leads to the definitional zero frequency divergence (ZFD) in the optical susceptibilities. Previous computations have shown nonequivalent res…
cond-mat.str-el1999
Optical Susceptibilities of Polymers: Current-Current versus Dipole-Dipole Correlation
Minzhong Xu, Xin Sun
The static current operator leads to definitional zero frequency divergence and unphysical results in studying nonlinear optical susceptibilities of polymers. A well-defined dipole…