Optical signature of cascade transitions between moiré interlayer excitons

Abstract

Cascade transition between energy levels has important applications, such as in quantum information protocols and quantum cascade lasers. In two-dimensional heterostructure, the moiré superlattice potential can result in multiple interlayer exciton (IX) energy levels. We demonstrate the cascade transitions between such moiré IXs by performing time- and energy-resolved photoluminescence measurements. We show that the lower-energy moiré IX can be excited to higher-energy ones, facilitating IX population inversion.

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Cited by in corpus (8)

• Localization and interaction of interlayer excitons in MoSe${}_2$/WSe${}_2$ heterobilayers
• A room-temperature moiré interlayer exciton laser
• Harmonic to anharmonic tuning of moiré potential leading to unconventional Stark effect and giant dipolar repulsion in WS${}_2$/WSe${}_2$ heterobilayer
• Confined-state physics and signs of fermionization of moiré excitons in WSe${}_2$/MoSe${}_2$ heterobilayers
• Optical Signatures of Moiré Trapped Biexcitons
• Excitonic thermalization bottleneck in twisted TMD heterostructures
• Spatial filtering of interlayer exciton ground state in WSe2/MoS2 heterobilayer
• Quantum siphoning of finely spaced interlayer excitons in reconstructed MoSe2/WSe2 heterostructures