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Advances in Solid State Physics

Volume 45 of the series Advances in Solid State Physics pp 135-147

Date:

Dynamical Variational Principles for Strongly Correlated Electron Systems

  • Michael PotthoffAffiliated withUniversität Würzburg

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Abstract

The self-energy-functional approach (SFA) is discussed in the context of different variational principles for strongly correlated electron systems. Formal analogies between static and dynamical variational approaches, different types of approximation strategies and the relations to density-functional and dynamical mean-field theory are emphasized. The discussion elucidates the strengths of the SFA in the construction of new non-perturbative approximations but also the limitations of the approach and thereby opens up future perspectives.

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