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Exciton Transport under Periodic Potential in MoSe2/WSe2 Heterostructures

The predicted formation of moire superlattices leading to confined excitonic states in heterostructures formed by stacking two lattice mismatched transition metal dichalcogenide (TMD) monolayers was recently experimentally confirmed. Such periodic potential in TMD heterostructure functions as a diffusion barrier that affects the energy transport and dynamics of interlayer excitons (electron and hole spatially concentrated in different monolayers). Understanding the transport of excitons under such condition is essential to establish the material system as a next generation device platform. In this work, we experimentally quantify the diffusion barrier experienced by the interlayer excitons in a hexagonal boron nitride (hBN) encapsulated, molybdenum diselenide tungsten/diselenide (MoSe2/WSe2) heterostructure by studying the exciton transport at various temperatures.