ANTIRES

From VASP Wiki
Revision as of 20:16, 13 January 2017 by Karsai (talk | contribs)

ANTIRES = 0 | 1 | 2 

The flag ANTIRES determines whether the Tamm-Dancoff approximation is used or not. The allowed settings are:

Default: ANTIRES = 0 default: Tamm-Dancoff approximation (TDA)
= 1 yields exact results at Failed to parse (syntax error): {\displaystyle &omega=0} at roughly the same cost as TDA
= 2 beyond Tamm-Dancoff, coupling between positive and negative frequencies

\begin{tabular}{ll} {\tt ANTIRES}=0 & default: Tamm-Dancoff approximation (TDA) \\ {\tt ANTIRES}=1 & yields exact results at $\omega=0$ at roughly the same cost as TDA \\ {\tt ANTIRES}=2 & beyond Tamm-Dancoff, coupling between positive and negative frequencies \end{tabular}

\noindent VASP uses the procedures outlines in Ref. \cite{Sander15} to include contributions beyond Tamm-Dancoff. Beyond TDA calculations increase the compute time and memory requirements by typically a factor 2.



Contents