Exciton Transport under Periodic Potential in MoSe2/WSe2 Heterostructures

Abstract

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.

12 pages, 4 figures

References in corpus (5)

• Observation of Long-Lived Interlayer Excitons in Monolayer MoSe2-WSe2 Heterostructures
• Observation of Moiré Excitons in WSe2/WS2 Heterostructure Superlattices
• Theory of optical absorption by interlayer excitons in transition metal dichalcogenide heterobilayers
• Highly Valley-Polarized Singlet and Triplet Interlayer Excitons in van der Waals Heterostructure
• Moiré lattice-induced formation and tuning of hybrid dipolar excitons in twisted WS${}_2$/MoSe${}_2$ heterobilayers

Cited by in corpus (1)

• Moiré induced topology and flat bands in twisted bilayer WSe${}_2$: A first-principles study