Spectral function of highly-correlated electron systems

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The frontier of modern solid state physics lies today in understanding the electronic properties of materials with strongly correlated electron systems. The valence electrons in these systems self-organize into novel ground states which are substantially different from conventional metals and insulators. Strong electron correlation in d- and f-metal systems depends sensitively on the structure, dimensionality, and chemical or magnetic ordering. It gives rise to a large variety of spectacular phenomena, including heavy-fermion behavior, high-temperature superconductivity, Peierls instabilities, and metal-insulator transitions. We will develop a microscopic quantum theoretical approach to correlated materials in order to investigate anomalies in the frequency and momentum dependent spectral functions. We will use dynamical mean-field theory combined with first-principles electronic structure methods to analyze the influence of electron correlations, structural disorder, and surface effects on the spectral function of transition metal and rare-earth compounds.