gftool.siam.gf0_loc_ret_t
- gftool.siam.gf0_loc_ret_t(tt, e_onsite, e_bath, hopping)[source]
Noninteracting retarded local Green’s function for the impurity.
- Parameters:
- tt(…) float np.ndarray
Time variable. Note that the retarded Green’s function is 0 for tt<0.
- 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:
- (…) complex np.ndarray
Retarded Green’s function of the impurity site.