Unveiling exciton many-body interactions in WS2 single crystal

Understanding the exciton many-body interactions and their recombination dynamics in transition metal dichalcogenides (TMDCs) are important for potential applications optoelectronics valleytronics. Herein, using ultrafast non-degenerate transient differential reflectance spectroscopy, we studied WS2 single crystal. Spectrally temporally resolved studies revealed strong interrelated excitonic of A, B C excitons associated stark blueshift broadening resonances. Additionally, observed an unusual prolonged decay direct band-gap (A exciton) with fluence, which interprets presence trap state system. Our findings provide a comprehensive understanding material’s intrinsic properties physics offers efficient pathways to optoelectronic based on TMDCs.