Photoemission Study of the Electronic Structure of Semiconducting Compounds

We review how the electronic structure of semiconducting compounds is revealed by photoemission spectroscopy. Angle-resolved photoemission spectroscopy is used to study band dispersions and the photon-energy dependence of spectral line shapes is utilized to study atomic orbital origins of the electronic states, namely, the partial density of states. We focus on recent development in the studies of diluted magnetic semiconductors as well as other magnetic semiconductors, in which interaction between the relatively localized transition-metal d states and the extended sp band states plays a key role in characterizing their unique magnetic, transport, and optical properties.