Journal
NATURE MATERIALS
Volume 19, Issue 6, Pages 624-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41563-020-0661-4
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Funding
- National Science Foundation through the EFRI programme [EFMA-1741691]
- National Science Foundation DMR award [1905809]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1905809] Funding Source: National Science Foundation
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Although 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 the MoSe2/WSe2 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 similar to 2 meV-an order of magnitude larger than the emission linewidth and corresponding to an inter-dipole distance of similar to 7 nm. At higher excitation power, multi-exciton complexes appear at systematically higher energies. The magnetic field dependence of the emission polarization is consistent with the spin-valley singlet nature of the dipolar molecular state. Our finding represents a step towards the creation of excitonic few- and many-body states such as dipolar crystals with spin-valley spinor in van der Waals heterostructures.
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