Dynamic second-order hyperpolarizabilities of Si2C and Si3C clusters using coupled cluster singles-and-doubles response approach

TL;DR

This paper calculates the dynamic second-order hyperpolarizabilities of Si2C and Si3C clusters using a high-accuracy coupled cluster response method, providing insights into their nonlinear optical properties.

Contribution

It applies the CCSD response approach to compute hyperpolarizabilities of Si2C and Si3C clusters, a novel application for these specific silicon-carbon clusters.

Findings

Static {b3} values are 1.99 and 3.16 d7 10^{-35} esu for Si2C and Si3C.

{b3} values are smaller than those of Si3 and Si4 clusters.

Smaller static {b3} of C atom compared to Si atom influences the results.

Abstract

We investigate the dynamic second-order hyperpolarizabilities {\gamma}(-3{\omega}; {\omega}, {\omega}, {\omega}) (indicated by {\gamma}THG) of the Si2C and Si3C clusters using the highly accurate coupled cluster singles-and-doubles (CCSD) response approach. The static {\gamma} values of the Si2C and Si3C clusters are 1.99 \times 10-35 and 3.16 \times 10-35 esu, respectively. Similar to the {\alpha} values, the {\gamma} values of the Si2C and Si3C clusters are smaller than those of the Si3 and Si4 clusters, respectively, which is related to much smaller static {\gamma} value of the C atom than the Si atom.