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Scientific article
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Dipolar interactions between localized interlayer excitons in van der Waals heterostructures

Published inNature materials, vol. 19, no. 6, p. 624-629
Publication date2020-04-13
First online date2020-04-13
Abstract

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 ~2 meV—an order of magnitude larger than the emission linewidth and corresponding to an inter-dipole distance of ~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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Citation (ISO format)
LI, Weijie et al. Dipolar interactions between localized interlayer excitons in van der Waals heterostructures. In: Nature materials, 2020, vol. 19, n° 6, p. 624–629. doi: 10.1038/s41563-020-0661-4
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ISSN of the journal1476-1122
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