WPLASMAI: Difference between revisions
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== Related Tags and Sections == | == Related Tags and Sections == | ||
*{{TAG|LOPTICS}} | *{{TAG|LOPTICS}} | ||
[[Category:Linear response]] [[Category:Dielectric properties]] | |||
Latest revision as of 16:04, 24 March 2026
WPLASMAI = [real]
Default: WPLASMAI = 0
Description: WPLASMAI sets the complex shift (in eV) for the Drude term in the dielectric function.
Metallic systems show a characteristic peak at $\omega=0$ in the imaginary dielectric function, which originates from intraband transitions. When WPLASMAI>0 in the calculation of the dielectric function with LOPTICS, these intraband transitions are accounted for via the Drude term:
\begin{equation} \varepsilon(\omega)=1-\frac{\omega_p^2}{\omega(\omega+i \gamma)}. \end{equation} Here, $\omega_p$ is the plasma frequency and the complex shift $\gamma$ introduces a Lorentzian broadening of the Drude peak which serves to account for scattering effects due to phonons, impurities, and electron-electron interactions. If WPLASMAI>0, the Drude term is introduced in both the density-density and current-current response functions.