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The excitonic homogeneous linewidth of an exfoliated monolayer MoSe$_2$encapsulated in hexagonal boron nitride is directly measured usingmultidimensional coherent spectroscopy with micron spatial resolution. Thelinewidth is 0.26 $\pm$ 0.02 meV, corresponding to a dephasing time $T_2\approx$ 2.5 ps, which is almost half the narrowest reported values fornon-encapsulated MoSe$_2$ flakes. We attribute the narrowed linewidth toCoulomb screening by the encapsulated material and suppression of non-radiativeprocesses. Through direct measurements of encapsulated and non-encapsulatedmonolayers, we confirm that encapsulation reduces the sample inhomogeneity.However, linewidths measured using photoluminescence and linear absorptionremain dominated by inhomogeneity, and these linewidths are roughly 5 timeslarger than the homogeneous linewidth in even the highest-quality encapsulatedmaterials. The homogeneous linewidth of non-encapsulated monolayers is verysensitive to temperature cycling, whereas encapsulated samples are not modifiedby temperature cycling. The nonlinear signal intensity of non-encapsulatedmonolayers is degraded by high-power optical excitation, whereas encapsulatedsamples are very resilient to optical excitation with optical powers up to thepoint of completely bleaching the exciton.

Encapsulation Narrows Excitonic Homogeneous Linewidth of Exfoliated MoSe$_2$ Monolayer