Generalized electronic susceptibility and charge-density waves in $1T-\mathrm{T}\mathrm{a}{\mathrm{S}}_2$ and $1T-\mathrm{T}\mathrm{a}{\mathrm{Se}}_2$

Generalized susceptibilities, ${\chi }^0\left(\overrightarrow{\mathrm{q}}\right)$, have been obtained for the $1T$ polymorphs of both Ta${\mathrm{S}}_2$ and Ta${\mathrm{Se}}_2$ from their Korringa-Kohn-Rostoker band structures. Peaks are found which correspond to the charge-density-wave (CDW) nesting vectors found by Wilson, Di Salvo, and Mahajan and appear to confirm the role of electronically driven instabilities as the origin of the observed CDW in these metals.