Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 24: Postersitzung III: Korrelierte Elektronen, ”Orbital Physics”

TT 24.13: Poster

Mittwoch, 10. März 2004, 14:30–19:00, Poster A

Self-energy-functional approach: New results and developments — •Michael Potthoff — Institut für Theoretische Physik und Astrophysik, Universität Würzburg

The self-energy-functional approach [1-3] is a general variational framework to construct non-perturbative and thermodynamically consistent approximations for lattice models of correlated electrons. The main idea is to shift the problem to a more simple reference system with the same (two-particle) interaction which is exactly solved for different one-particle parameters. The parameters are fixed by evaluation of a fundamental variational principle for the self-energy.

This contribution gives an overview over the recent developments in the extension of the approach to Bose systems, two-particle excitations or disordered systems and discusses efficient numerical methods to evaluate the variational principle.

[1] M.P., EPJB 32, 429 (2003)

[2] M.P., M. Aichhorn and C. Dahnken, PRL 91, 206402 (2003)

[3] M.P., EPJB in press, cond-mat/0306278