Excitonic transport driven by repulsive dipolar interaction in a van der Waals heterostructure

Abstract

Dipolar bosonic gases are currently the focus of intensive research due to their interesting many-body physics in the quantum regime. Their experimental embodiments range from Rydberg atoms to GaAs double quantum wells and van der Waals heterostructures built from transition metal dichalcogenides. Although quantum gases are very dilute, mutual interactions between particles could lead to exotic many-body phenomena such as Bose-Einstein condensation and high-temperature superfluidity. Here, we report the effect of repulsive dipolar interactions on the dynamics of interlayer excitons in the dilute regime. By using spatial and time-resolved photoluminescence imaging, we observe the dynamics of exciton transport, enabling a direct estimation of the exciton mobility. The presence of interactions significantly modifies the diffusive transport of excitons, effectively acting as a source of drift force and enhancing the diffusion coefficient by one order of magnitude. The repulsive dipolar interactions combined with the electrical control of interlayer excitons opens up appealing new perspectives for excitonic devices.

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Cited by in corpus (29)

• Electrical control of hybrid exciton transport in a van der Waals heterostructure
• Exciton optics, dynamics and transport in atomically thin semiconductors
• Interface engineering of charge-transfer excitons in 2D lateral heterostructures
• Interlayer Exciton Diode and Transistor
• Localization and interaction of interlayer excitons in MoSe${}_2$/WSe${}_2$ heterobilayers
• Microscopic origin of anomalous interlayer exciton transport in van der Waals heterostructures
• Interaction-driven transport of dark excitons in 2D semiconductors with phonon-mediated optical readout
• Topological flat bands in strained graphene: substrate engineering and optical control
• Transport and localization of indirect excitons in a van der Waals heterostructure
• Exciton-exciton interactions in van der Waals heterobilayers
• Bright dipolar excitons in twisted black phosphorus homostructures
• Lattice reconstruction in MoSe${}_2$-WSe${}_2$ heterobilayers synthesized by chemical vapor deposition
• Harmonic to anharmonic tuning of moiré potential leading to unconventional Stark effect and giant dipolar repulsion in WS${}_2$/WSe${}_2$ heterobilayer
• Electrically tunable dipolar interactions between layer-hybridized excitons
• Thickness and twist angle dependent interlayer excitons in metal monochalcogenide heterostructures
• Confined-state physics and signs of fermionization of moiré excitons in WSe${}_2$/MoSe${}_2$ heterobilayers
• Direct visualization of hybrid excitons in van der Waals heterostructures
• Interlayer exciton polaritons in homobilayers of transition metal dichalcogenides
• Electrically tunable layer-hybridized trions in doped WSe${}_2$ bilayers
• Single exciton trapping in an electrostatically defined 2D semiconductor quantum dot
• Anomalous magneto-optical response and chiral interface of dipolar excitons at twisted valleys
• Interplay of trapped species and absence of electron capture in Moiré heterobilayers
• Viscous hydrodynamics of excitons in van der Waals heterostructures
• Two dimensional semiconductors: optical and electronic properties
• Polariton transport in 2D semiconductors: Phonon-mediated transitions between ballistic, superdiffusive and exciton-limited regimes
• Electrically tunable MoSe${}_2$/WSe${}_2$ heterostructure-based quantum dot
• Long-range spatial extension of exciton states in van der Waals heterostructure
• Laterally Extended States of Interlayer Excitons in Reconstructed MoSe${}_2$/WSe${}_2$ Heterostructures
• Effects of Strain-Induced Pseudogauge Fields on Exciton Dispersion, Transport, and Interactions in Transition Metal Dichalcogenides Nanoribbons