PHOTOEMISSION IN LOW-DIMENSIONAL SYSTEMS

We briefly review some recent photoelectron spectroscopy (PES) studies of quasi one- and two-dimensional metallic systems. We discuss the sp ectral features of a metallic system, the expected fingerprints of the metal-insulator transition and some experimental and conceptual limit ations of the single particle framework. This approach gives a satisfa ctory interpretation of PES experiments in 2D charge-density-wave mate rials. The single particle picture is however incompatible with experi ments on 1D systems.