Parameter: nffrq
Definition
Number of fermionic Matsubara frequency points for the two-particle green's function.
The two-particle Green's function $\chi(i\omega_n, i\omega'_n, i\nu_n)$ and vertex function $\mathcal{F}(i\omega_n, i\omega'_n, i\nu_n)$ have three frequency indices where $\omega_n$ and $\omega'_n$ are fermionic frequencies, and $\nu_n$ bosonic frequency:
\[\nu_n = \frac{2n\pi}{\beta}\]
\[\omega_n = \frac{(2n+1)\pi}{\beta}\]
The nbfrq parameter is used to define and generate $\nu_n$ bosonic mesh. The corresponding $\omega_n$ fermionic mesh is defined by the nffrq parameter.
Type
Integer
Default value
32
Component
Only for the GARDENIA, NARCISSUS, CAMELLIA, LAVENDER, and MANJUSHAKA components.
Behavior
Determine the size of involved arrays. Only useful when we need to compute the two-particle quantities.
Comment
If the nffrq is too large, the computational time is not bearable. So we suggest to set nffrq $< 128$. The computation of two-particle quantities is extremely time-consuming, though we have tried our best optimizing it.
See nbfrq and nfreq for more details.
The computation of two-particle quantities has been optimized using the OpenMP multi-thread technology. You can enable this feature in the compiling procedure. See also Compiling environment for more details.