Probing biexciton in monolayer WS₂ through controlled many-body interaction

The monolayers of semiconducting transition metal dichalcogenides host strongly bound excitonic complexes and are an excellent platform for exploring many-body physics. Here we demonstrate a controlled kinetic manipulation the five-particle complex, charged biexciton, through systematic dependence biexciton peak on excitation power, gate voltage, temperature using steady-state time-resolved photoluminescence (PL). With help combination experimental data rate equation model, argue that binding energy is less than spectral separation its from neutral exciton. We also note while momentum-direct radiative recombination exciton restricted within light cone, such restriction relaxed due to presence near-parallel excited final states in momentum space.