Many-body properties of solids studied by angle-resolved photoemission spectroscopy (ARPES): application to conventional and unconventional superconductors
Prof. Dr. Jörg Fink (IFF Dresden)

The understanding of correlation effects and other many-body properties in solids is of vital interest for the understanding of the macroscopic properties such as the resistivity, magnetism, or superconductivity. This dressing of the charge carriers is normally described by the complex self-energy function which is related to the effective mass enhancement and the scattering rate. Due to the strongly increased energy and momentum resolution, angle-resolved photoemission (ARPES) has developed to the method to study the self-energy. In this contribution I will review recent very high resolution ARPES studies on particular superconductors: firstly I will present studies on the dressing of charge carriers by anisotropic electron-phonon coupling in intercalated graphite (having an electronic structure very similar to that of graphene); secondly I will review our systematic studies on the coupling of charge carriers to magnetic excitations in high-Tc superconductors. Finally I will discuss the relationship between the dressing of the charge carriers and the mechanism of superconductivity in these systems.