Dipolar interactions between field-tuneable, localized emitters in van der Waals heterostructures

Abstract

While photons in free space barely interact, matter can mediate interactions between them resulting in optical nonlinearities. Such interactions at the single-quantum level result in an on-site photon repulsion, crucial for photon-based quantum information processing and for realizing strongly interacting many-body states of light. Here, we report repulsive dipole-dipole interactions between electric field tuneable, localized interlayer excitons in MoSe${}_2$/WSe${}_2$ heterobilayer. The presence of a single, localized exciton with an out-of-plane, non-oscillating dipole moment increases the energy of the second excitation by $\sim$ 2 meV -- an order of magnitude larger than the emission linewidth and corresponding to an inter-dipole distance of $\sim$ 5 nm. At higher excitation power, multi-exciton complexes appear at systematically higher energies. The magnetic field dependence of the emission polarization is consistent with spin-valley singlet nature of the dipolar molecular state. Our finding is an important step towards the creation of excitonic few- and many-body states such as dipolar crystals with spin-valley spinor in van der Waals (vdW) heterostructures.

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Cited by in corpus (56)

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• Moiré Excitons Correlated with Superlattice Structure in Twisted WSe${}_2$/WSe${}_2$ Homobilayers
• Twist Angle Dependent Interlayer Exciton Lifetimes in van der Waals Heterostructures
• Excitonic transport driven by repulsive dipolar interaction in a van der Waals heterostructure
• Electronic structures, charge transfer and charge orders in twisted transition metal dichalcogenide bilayers
• Correlated insulator of excitons in WSe2/WS2 moiré superlattices
• Discrete Interactions between a few Interlayer Excitons Trapped at a MoSe${}_2$-WSe${}_2$ Heterointerface
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• Optical read-out of Coulomb staircases in a moiré superlattice via trapped interlayer trions
• Optical control of valley Zeeman effect through many-exciton interactions
• Localization and interaction of interlayer excitons in MoSe${}_2$/WSe${}_2$ heterobilayers
• Evidence for Exciton Crystals in a 2D Semiconductor Heterotrilayer
• Magnon-mediated exciton-exciton interaction in a van der Waals antiferromagnet
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