Spatial filtering of interlayer exciton ground state in WSe2/MoS2 heterobilayer

Abstract

Long-life interlayer excitons (IXs) in transition metal dichalcogenide (TMD) heterostructure are promising for realizing excitonic condensates at high temperatures. Critical to this objective is to separate the IX ground state (the lowest energy of IX state) emission from other states emissions. Filtering the IX ground state is also essential in uncovering the dynamics of correlated excitonic states, such as the excitonic Mott insulator. Here, we show that the IX ground state in WSe2/MoS2 heterobilayer can be separated from other states by its spatial profile. The emissions from different moire IX modes are identified by their different energies and spatial distributions, which fits well with the rate-diffusion model for cascading emission. Our results show spatial filtering of the ground state mode and enrich the toolbox to realize correlated states at elevated temperatures.

28 pages, 18 figures, 1 table, journal

References in corpus (12)

• Observation of Long-Lived Interlayer Excitons in Monolayer MoSe2-WSe2 Heterostructures
• Observation of Moiré Excitons in WSe2/WS2 Heterostructure Superlattices
• Strong interlayer coupling in van der Waals heterostructures built from single-layer chalcogenides
• Resonantly hybridised excitons in moiré superlattices in van der Waals heterostructures
• Moiré excitons: from programmable quantum emitter arrays to spin-orbit coupled artificial lattices
• Evidence of high-temperature exciton condensation in 2D atomic double layers
• High-temperature superfluidity with indirect excitons in van der Waals heterostructures
• Theory of optical absorption by interlayer excitons in transition metal dichalcogenide heterobilayers
• Correlated insulator of excitons in WSe2/WS2 moiré superlattices
• Ultrafast charge-transfer dynamics in twisted MoS${}_2$/WSe${}_2$ heterostructures
• Mott insulator of strongly interacting two-dimensional excitons
• Optical signature of cascade transitions between moiré interlayer excitons

Cited by in corpus (1)

• First-Principles Insights into Excitonic and Electron-Phonon Effects in van der Waals Heterostructures