Abstract
The formation of bound states and their modifications within a dense medium is an important aspect of strongly coupled Coulomb systems. In particular, within the concept of a partially ionized plasma, the plasma is considered as a mixture of electrons and ions in free and bound states. The account of the interaction with the medium by self-energy shifts for the free and bound states becomes less founded at high densities. Within the framework of a systematic Green's function approach, the spectral function is investigated. It is demonstrated how a band is formed if additional contributions which describe hopping between bound states are taken into account. In this way, the connection to condensed matter approaches can be made directly which has not been shown before.
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