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.