Observation of biexcitons in monolayer WSe2

By Yumeng You, Xiao-Xiao Zhang, Timothy C. Berkelbach, M. Hybertsen, David R. Reichman, T. Heinz. Nature Physics, 2015

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Exciton physics and device application of two-dimensional transition metal dichalcogenide semiconductors (2018, background): “In parallel, other exciton complexes, such as charged excitons (trions) [11-13] and biexcitons [14, 15], have been studied.”
Micro-reflectance and transmittance spectroscopy: a versatile and powerful tool to characterize 2D materials (2016, methodology): “This can be explained by noting that biexcitons, which have a higher time constant, are the most density-dependent feature [49].”
From two-dimensional materials to their heterostructures: An electrochemist's perspective (2017, background): “Biexcitons with a binding energy of ∼52 meV have also been recently observed in the emission spectra of monolayer WSe2 at high exciton densities [59].”
Defects as a factor limiting carrier mobility in WSe2: A spectroscopic investigation (2016, methodology): “5  W) can be treated as linear dependence on incident laser power [34], we normalized the PL spectra by X0 intensity to emphasize the change of Xb intensity.”