Probing biexciton in monolayer WS${}_2$ through controlled many-body interaction

Abstract

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 of the five-particle excitonic complex, the charged biexciton, through a systematic dependence of the biexciton peak on excitation power, gate voltage, and temperature using steady-state and time-resolved photoluminescence (PL). With the help of a combination of the experimental data and a rate equation model, we argue that the binding energy of the charged biexciton is less than the spectral separation of its peak from the neutral exciton. We also note that while the momentum-direct radiative recombination of the neutral exciton is restricted within the light cone, such restriction is relaxed for a charged biexciton recombination due to the presence of near-parallel excited and final states in the momentum space.

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• Observation of giant bandgap renormalization and excitonic effects in a monolayer transition metal dichalcogenide semiconductor
• Tightly bound excitons in monolayer WSe2
• Gate tunable dark trions in monolayer WSe${}_2$
• Excitonic complexes in $n$-doped WS${}_2$ monolayer
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Cited by in corpus (4)

• Exciton-polaron interactions in monolayer WS${}_2$
• Trion-trion annihilation in monolayer WS${}_2$
• Biexciton-like quartet condensates in an electron-hole liquid
• Tensile strain induced brightening of momentum forbidden dark exciton in WS${}_2$