Self-energy-functional theory is a formal framework which allows to derive non-perturbative and thermodynamically consistent approximations for lattice models of strongly correlated electrons from a general dynamical variational principle. The construction of the self-energy functional and the corresponding variational principle is developed within the path-integral formalism. Different cluster mean-field approximations, like 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.
CITATION STYLE
Avella, A., & Mancini, F. (2012). Strongly Correlated Systems - Numerical Methods. Theoretical Methods for Strongly Correlated Systems (Vol. 171, p. 38). Retrieved from http://link.springer.com/10.1007/978-3-642-21831-6
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