Abstract
Abstract The low-lying electronic excitations of conventional metals can be described as quasi-particles with characteristic spectral properties which can in principle be probed by angle-resolved photoelectron spectroscopy (ARPES). Data taken on a suitable Fermi liquid (FL) material are discussed in terms of quasi-particle energy renormalization and lifetime width narrowing towards the Fermi level. In contrast, the unusual behavior observed in the spectra of a quasi-one-dimensional metal indicates a possible breakdown of the quasi-particle picture. I further discuss the mapping of Fermi surfaces using ARPES in the constant energy mode and suggest a method for precise Fermi vector determination based on FL properties.
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