# Berlin 2015 – wissenschaftliches Programm

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# TT: Fachverband Tiefe Temperaturen

## TT 86: Correlated Electrons: (General) Theory 2

### TT 86.12: Vortrag

### Donnerstag, 19. März 2015, 12:30–12:45, H 3005

**Inverse Mean Field theories** — •Peter Schmitteckert — Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany

Methods based on many particle wave functions are naturally suited to describe strongly correlated quantum system and enable the description of non-perturbative problems. However, an intuitive description of many particle wave functions is often lacking. In contrast, mean field (MF) theories cannot treat interaction effects rigorously, but provide simple pictures within a single particle framework. In mean field theories one typically introduces a mean field decoupling of the Hamiltonian which is then solved within a single particle description. Here we go the other direction. We first solve for a many particle wave function, which is then used to construct a corresponding MF description. Specifically we discuss different strategies to construct a suitable mean field theory, which can then be used to discuss the physical problem. Finally we address the problem of describing time dependent phenomena of correlated quantum systems within an inverse MF description.