gem.fragment.Fragment.compute_Z

Fragment.compute_Z(mu=0.0, z0=0.0, h=0.0001)

Compute the quasiparticle weight Z from the self-energy parameters in the local case.

Parameters:

• mu – float, optional. Chemical potential (default: 0.0).

• z0 – float, optional. Frequency at which to compute Z (default: 0.0).

• h – float, optional. Step size for finite difference (default: 1e-4).

Return:

Z: float. Quasiparticle weight.