Two-species k-body embedded Gaussian unitary ensembles: q-normal form of the eigenvalue density

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The eigenvalue density generated by an embedded Gaussian unitary ensemble with k-body interactions for two-species (say π and ν ) fermion systems is investigated by deriving formulas for the lowest six moments. Assumed in constructing this ensemble, called EGUE(), is that the π fermions (m 1 in number) occupy N 1 number of degenerate single particle (sp) states, and similarly the ν fermions (m 2 in number) occupy N 2 number of degenerate sp states. The Hamiltonian is assumed to be k-body preserving . Formulas with finite corrections and asymptotic limit formulas both show that the eigenvalue density takes q-normal form with the q parameter defined by the fourth moment. The EGUE() formalism and results are extended to two-species boson systems. The results in this work show that the q-normal form of the eigenvalue density established only recently for identical fermion and boson systems extends to two-species fermion and boson systems.