Domaines
Nouveaux états électroniques de la matière corrélée
Type of internship
Expérimental Description
Strong electronic correlations give rise to exotic forms of electronic orderings, such as high temperature superconductivity or colossal magnetoresistance. In recent years, the question arose of how they could also influence topological properties, where exotic fermions, such as Dirac or Weyl fermions have been discovered. Up to now, correlated and topological properties have been actively studied, but mostly separately, as they rarely coexist in the same materials. Most topological materials known today are weakly correlated semiconductors, which are rather well described by band theory, unlike correlated systems. Finding similar properties in correlated systems could add new dimensions to the problem. Magnetism is for example common in correlated transition metal, giving rise to new topological properties. We propose the study of systems containing kagome planes of transition metals (Fe, Co, Rh…), which intrinsically bring together strong correlations and topologically non-trivial band structures. We propose to synthesize and characterize in the laboratory compounds from different kagome families and apply to them various perturbations (doping, strain…) to modify their properties. We will then perform angle resolved photoemission experiments at the SOLEIL synchrotron near our laboratory to study its electronic band structure and check for the presence of topological and/or correlated properties.
Contact
Véronique Brouet