gftool.siam.gf0_loc_z¶
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gftool.siam.gf0_loc_z(z, e_onsite, e_bath, hopping_sqr)[source]¶ 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_sqr(…, Nb) complex np.ndarray
Absolute square of hopping matrix element between impurity and the bath sites.
- Returns
- gf0_loc_z(…) complex np.ndarray
Green’s function of the impurity site.