gftool.bethe_gf_d2_z
- gftool.bethe_gf_d2_z(z, half_bandwidth)
Second derivative of local Green’s function of Bethe lattice for infinite coordination number.
- Parameters:
- zcomplex array_like or complex
Green’s function is evaluated at complex frequency z.
- half_bandwidthfloat
Half-bandwidth of the DOS of the Bethe lattice. The half_bandwidth corresponds to the nearest neighbor hopping t=D/2.
- Returns:
- complex np.ndarray or complex
Value of the Green’s function.
See also