LDISENTANGLED

LDISENTANGLE = [logical]
Default: LDISENTANGLE = .FALSE.

Selects the cRPA method of Miyake, Aryasetiawan and Imada^[1]. Following screening are subtracted from the full RPA polarizability:

{\tilde {\chi }}_{{\bf {G,G}}'}^{\sigma }({\bf {q}},i\omega )={\frac {1}{N_{k}}}\sum _{\bf {k}}\sum _{nn'\in {\cal {T}}}{\frac {f_{n{\bf {k}}}-f_{n'{\bf {k-q}}}}{{\tilde {\epsilon }}_{n{\bf {k}}}-{\tilde {\epsilon }}_{n'{\bf {k-q}}}-i\omega }}\langle {\tilde {u}}_{n{\bf {k}}}^{\sigma }|e^{-i{\bf {(G+q)r}}}|{\tilde {u}}_{n'{\bf {k-q}}}^{\sigma '}\rangle \langle {\tilde {u}}_{n'{\bf {k-q}}}^{\sigma '}|e^{-i{\bf {(G'-q)r'}}}|{\tilde {u}}_{n{\bf {k}}}^{\sigma }\rangle

,

where ${\tilde {\epsilon }}_{n{\bf {k}}}^{\sigma }$ is the disentangled band structure.

References