gem.fragment.Fragment.compute_Z

Fragment.compute_Z(mu=0.0, z0=0.0, h=1e-08)

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

Parameters:

• mu – float. Chemical potential.

• z0 – float. Frequency at which to compute Z.

• h – float. Step size for finite difference.

Return:

Z: float. Quasiparticle weight.