Charged exciton kinetics in monolayer MoSe${}_2$ near ferroelectric domain walls in periodically poled LiNbO${}_3$

Abstract

Monolayers of semiconducting transition metal dichalcogenides are a strongly emergent platform for exploring quantum phenomena in condensed matter, building novel opto-electronic devices with enhanced functionalities. Due to their atomic thickness, their excitonic optical response is highly sensitive to their dielectric environment. In this work, we explore the optical properties of monolayer thick MoSe${}_2$ straddling domain wall boundaries in periodically poled LiNbO${}_3$. Spatially-resolved photoluminescence experiments reveal spatial sorting of charge and photo-generated neutral and charged excitons across the boundary. Our results reveal evidence for extremely large in-plane electric fields of 3000\,kV/cm at the domain wall whose effect is manifested in exciton dissociation and routing of free charges and trions toward oppositely poled domains and a non-intuitive spatial intensity dependence. By modeling our result using drift-diffusion and continuity equations, we obtain excellent qualitative agreement with our observations and have explained the observed spatial luminescence modulation using realistic material parameters.

29 pages, 6 figures, submetted material

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Cited by in corpus (4)

• Excitonic Tonks-Girardeau and charge-density wave phases in monolayer semiconductors
• Pyroelectric doping reversal of MoS2 p-n junctions on ferroelectric domain walls probed by photoluminescence
• Trion Engineered Multimodal Transistors in Two dimensional Bilayer Semiconductor Lateral Heterostructures
• Investigating the Ferroelectric Potential Landscape of 3R-MoS${}_2$ through Optical Measurements