Superconductivity and nematic phases in iron pnictides from LDA+Gutzwiller theory

铁化合物的非常规超导电性和其他有趣的电子性质主要是由于其独特的电子结构和铁3d轨道中电子之间的库仑相互作用造成的。为了研究铁粒子，我们将采用最近发展起来的一种变分方法，用它我们成功地研究了单带Hubbard模型中的关联诱导超导电性。我们将把我们的方法与铁化合物电子结构的实际多带模型结合起来。我们的方法将对超导有序和旋转对称性破缺的向列相的出现提供有价值的见解，因为它比迄今在该领域使用的唯象和多体方法更准确和更受控制。

The unconventional superconductivity and other interesting electronic properties of iron pnictides are mainly caused by their unique electronic structure and the Coulomb interaction between electrons in the iron 3d-orbitals. For the investigation of the iron pnictides, we shall employ a recently developed variational method with which we have successfully investigated the correlation-induced superconductivity in single-band Hubbard models. We shall combine our method with realistic multiband models of the electronic structure of iron pnictides. Our method shall provide valuable insights into the superconducting order and the appearance of ‘nematic’ phases with broken rotational symmetry since it is sensibly more accurate and controlled than phenomenological and many-body methods employed in the field so far.