High-temperature superconductivity in iron pnictides and chalcogenides emerges when a
magnetic phase is suppressed. The multi-orbital character and the strength of correlations …

To clarify the nature of correlations in Hund metals and its relationship with Mott physics we
analyze the electronic correlations in multiorbital systems as a function of intraorbital …

The recently observed superconductivity in twisted bilayer graphene emerges from
insulating states believed to arise from electronic correlations. While there have been many …

Slave-spin mean-field theory, a light and accurate technique to model electronic correlations
in Fermi-liquid phases of multi-orbital materials, is pedagogically exposed in this chapter …

The theoretical understanding of the nematic state of iron-based superconductors and
especially of FeSe is still a puzzling problem. Although a number of experiments call for a …

We perform, as a function of uniaxial stress, an optical-reflectivity investigation of the
representative “parent” ferropnictide BaFe 2 As 2 in a broad spectral range, across the …

Undoped iron superconductors accommodate n= 6 electrons in five d orbitals. Experimental
and theoretical evidence shows that the strength of correlations increases with hole do** …

The detailed optical properties have been determined for the iron-based materials A Fe 2 As
2, where A= Ca, Sr, and Ba, for light polarized in the iron-arsenic (ab) planes over a wide …

There are two prerequisites for understanding high-temperature (high-T c)
superconductivity: identifying the pairing interaction and obtaining a correct description of …

Using muon spin rotation and infrared spectroscopy, we study the relation between
magnetism and superconductivity in Ba 1− x K x Fe 2 As 2 single crystals from the …