Abstract
The single-hole states are studied by the exact diagonalization method in two models for strongly correlated systems: the single-band effective (t-J) model and the Kondo-lattice model. The coherent mass ${\mathit{m}}^{\mathrm{*}}$ of the quasiparticle and the frequency-dependent conductivity \ensuremath{\sigma}(\ensuremath{\omega}) are calculated for clusters with 4\ifmmode\times\else\texttimes\fi{}4 and 8\ifmmode\times\else\texttimes\fi{}4 sites. In particular, \ensuremath{\sigma}(\ensuremath{\omega}) shows an isolated quasiparticle peak of weak intensity at small \ensuremath{\omega} and a broad but structured incoherent part at higher \ensuremath{\omega}.
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