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Low-dimensional transition metal dichalcogenide, TMDC, materials areheralding a new era in optoelectronics and valleytronics owing to their uniqueproperties. Photo-induced dynamics in these systems has mostly been studiedfrom the perspective of individual quasi-particles, including excitons,bi-excitons or, even, trions. Their formation, evolution and decay. The role ofmulti-body and exciton dynamics, the associated collective behaviour,condensation and inter-excitonic interactions remain intriguing and seekattention, especially in room-temperature scenarios which are relevant fordevice applications. In this work we evidence the formation and decay of anunexpected electron-hole quantum liquid phase at room-temperature on ultrafastpicosecond timescales in multi-layer MoS2 nanoparticles through femtosecondbroadband transient absorption spectroscopy. Our studies reveal the completedynamical picture: the initial electron-hole plasma, EHP, condenses into anquantum electron-hole liquid, EHL, phase which typically lasts as long as 10ps, revealing its robustness, whereafter the system decays through phonons.

Emergence and relaxation of an e-h quantum liquid phase in photoexcited MoS2 nanoparticles at room temperature