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- Tobias Schickling, Florian Gebhard, Jörg Bünemann, Lilia Boeri, Ole Krogh Andersen, Werner Weber
- Physical review letters
- 2012

We use the Gutzwiller variational theory to calculate the ground-state phase diagram and quasiparticle bands of LaOFeAs. The Fe3d-As4p Wannier-orbital basis obtained from density-functional theory… (More)

- Alexander Hofmann, Xiang Yuan Cui, +11 authors R Claessen
- Physical review letters
- 2009

The quasiparticle dynamics of electrons in a magnetically ordered state is investigated by high-resolution angle-resolved photoemission of Ni(110) at 10 K. The self-energy is extracted for high… (More)

Using the generalized Gutzwiller method we present results on the ferromagnetic behavior of extended Hubbard models with two degenerate d(e g) orbitals. We find significant differences to results… (More)

- Tobias Schickling, Florian Gebhard, Jörg Bünemann
- Physical review letters
- 2011

We investigate multiband Hubbard models for the three iron 3d t(2g) bands and the two iron 3d e(g) bands in LaOFeAs by means of the Gutzwiller variational theory. Our analysis of the paramagnetic… (More)

We have generalized the Gutzwiller method to the cases of n ≥ 2 correlated bands and report studies on a degenerate two-band model with Hund's rule type on-site interactions. At half band filling the… (More)

- E v Oelsen, Götz Seibold, Jörg Bünemann
- Physical review letters
- 2011

Based on the variational Gutzwiller theory, we present a method for the computation of response functions for multiband Hubbard models with general local Coulomb interactions. The improvement over… (More)

- Jörg Bünemann, Florian Gebhard
- Journal of physics. Condensed matter : an…
- 2017

Coulomb matrix elements are needed in all studies in solid-state theory that are based on Hubbard-type multi-orbital models. Due to symmetries, the matrix elements are not independent. We determine a… (More)

- Jörg Bünemann, Florian Gebhard, Katalin Radnóczi, Patrik Fazekas
- Journal of physics. Condensed matter : an…
- 2005

We investigate the electronic and superconducting properties of a negative-U Hubbard model. For this purpose we evaluate a recently introduced variational theory based on Gutzwiller-correlated BCS… (More)

- Jörg Bünemann, K. Jávorne-Radnóczi, Patrik Fazekas, Florian Gebhard

We use the Gutzwiller variational many-body theory to investigate the stability of orbitally ordered states in a two-band Hubbard-model without spin degrees of freedom. Our results differ… (More)