gftool.lattice.bethe.gf_d2_z¶
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gftool.lattice.bethe.gf_d2_z(z, half_bandwidth)[source]¶ 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
- gf_d2_zcomplex np.ndarray or complex
Value of the Green’s function
See also