Interlayer excitons confined in bilayer heterostructures of transition metal dichalcogenides (TMDs) offer a promising route to implement two-dimensional dipolar superfluids. Here we study the experimental conditions necessary for the realisation of such a collective state. Particularly, we show that the moiré potential inherent to TMD bilayers yields an exponential increase of the excitons' effective mass. To allow for exciton superfluidity at sizable temperatures it is then necessary to intercalate a high-$\kappa$ dielectric between the monolayers confining electrons and holes. Thus, the moiré lattice depth is sufficiently weak for a superfluid phase to theoretically emerge below a critical temperature of around 10 K. Importantly, for realistic experimental parameters, interlayer excitons quasicondense in a state with finite momentum, so that the superfluid is optically inactive and flows spontaneously.

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• BKT transition
• Excitons
• Bose-Einstein condensates
• Quantum wells
• Semiconductor compounds
• Superfluids
• Transition metal dichalcogenides
• Photoluminescence