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Moir\'e trapped interlayer excitons (IXs) in heterobilayer transition metaldichalcogenides currently attract strong interest due to their potential fornon-classical light generation, coherent spin-photon interfaces and exploringnovel correlated phases of electrons. Here, we report lasing of moir\'e trappedIXs by integrating a pristine hBN-encapsulated MoSe$_2$/WSe$_2$ heterobilayerin a high-Q ($>10^4$) nanophotonic cavity. We control the detuning between theIX line and the cavity mode with a magnetic field and measure the dipolarcoupling strength to the cavity mode to be $78 \pm 4\ \mathrm{\mu eV}$, fullyconsistent with the $82\ \mathrm{\mu eV}$ predicted by theory. The emissionfrom the cavity mode shows clear threshold-like behaviour. We observe asuperlinear power dependence accompanied by a narrowing of the linewidth as thedistinct features of lasing. The onset and prominence of these threshold-likebehaviours are significant at resonance whilst weak off-resonance. Our resultsshow that a lasing transition can be induced in interacting moir\'e trapped IXswith macroscopic coherence extending over the lengthscale of the cavity mode.Such systems raise interesting perspectives for low-power switching andsynaptic nanophotonic devices using 2D materials.

Lasing of Moir\'e Trapped MoSe$_2$/WSe$_2$ Interlayer Excitons Coupled to a Nanocavity