English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Based on Takayama-Lin-Liu-Maki model, analytical expressions for thethird-harmonic generation, DC Kerr effect, DC-induced second harmonic opticalKerr effect, optical Kerr effect or intensity-dependent index of refraction andDC-electric-field-induced optical rectification are derived under the staticcurrent-current($J_0J_0$) correlation for one-dimensional infinite chains. Theresults of hyperpolarizabilities under $J_0J_0$ correlation are then comparedwith those obtained using the dipole-dipole ($DD$) correlation. The comparisonshows that the conventional $J_0J_0$ correlation, albeit quite successful forthe linear case, is incorrect for studying the nonlinear optical properties ofperiodic systems.Comment: 11 pages, 5 figure

Hyperpolarizabilities for the one-dimensional infinite single-electron periodic systems. II. Dipole-dipole versus current-current correlations