gftool.siam.gf0_loc_z

gftool.siam.gf0_loc_z(z, e_onsite, e_bath, hopping_sqr)

Noninteracting local Green’s function for the impurity.

Parameters:

z : (…) complex np.ndarray

Complex frequency variable.

e_onsite : (…) float np.ndarray

On-site energy of the impurity site.

e_bath : (…, Nb) float np.ndarray

On-site energy of the bath sites.

hopping : (…, Nb) complex np.ndarray

Hopping matrix element between impurity and the bath sites.

Returns:

gf0_loc_z : (…) complex np.ndarray

Green’s function of the impurity site.