What is STAP energy function?
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The self-energy functional theory is a formal framework that allows for the derivation of non-perturbative and thermodynamically consistent approximations for lattice models of strongly correlated electrons from a general dynamical variational principle. It involves the construction of a self-energy functional and a corresponding variational principle within the path-integral formalism. Different cluster mean-field approximations, such as the variational cluster approximation and cluster extensions of dynamical mean-field theory, are derived in this context, and their mutual relationship and internal consistency are discussed .
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