The combined influence of biexcitons and the two‐exciton scattering continuum is analyzed. The analysis is based on a density matrix description of a two‐band semiconductor accounting for mean‐field contributions, bound biexcitons and the correlated parts of the two‐exciton scattering continuum on a common footing. Consistent with the microscopic formulation, the influence of biexcitons as well as that of the two‐exciton continuum is represented by a correlation kernel which is obtained from an integral equation. For a one‐dimensional model four‐wave mixing signals are calculated solving numerically the resulting coupled nonlinear equations for excitation conditions in the vicinity of the 1s resonance. A strong compensation between the exciton–exciton continuum and the mean‐field contribution is found for all excitation conditions studied. Surprisingly, biexcitonic signatures turn out to be enhanced when continua are included in the description.
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