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Composite structure of particles somewhat modifies their statistics, comparedto the pure Bose- or Fermi-ones. The spin-statistics theorem, so, is not validanymore. Say, $\pi$-mesons, excitons, Cooper pairs are not ideal bosons, and,likewise, baryons are not pure fermions. In our preceding papers, we studiedbipartite composite boson (i.e. quasiboson) systems via a realization bydeformed oscillators. Therein, the interconstituent entanglementcharacteristics such as entanglement entropy and purity were found in terms ofthe parameter of deformation. Herein, we perform an analogous study ofcomposite Fermi-type particles, and explore them in two major cases: (i) "boson+ fermion" composite fermions (or cofermions, or CFs); (ii) "deformed boson +fermion" CFs. As we show, cofermions in both cases admit only the realizationby ordinary fermions. Case (i) is solved explicitly, and admissiblewavefunctions are found along with entanglement measures. Case (ii) is treatedwithin few modes both for CFs and constituents. The entanglement entropy andpurity of CFs are obtained via the relevant parameters and illustratedgraphically.

Composite Fermions as Deformed Oscillators: Wavefunctions and Entanglement