Heterostructures combining a thin layer of quantum emitters and planar nanostructures enable custom-tailored photoluminescence in an integrated fashion. Here, we demonstrate a photonic Rashba effect from valley excitons in a WSe2 monolayer, which is incorporated into a photonic crystal slab with geometric phase defects, that is, into a Berry-phase defective photonic crystal. This phenomenon of spin-split dispersion in momentum space arises from a coherent geometric phase pickup assisted by the Berry-phase defect mode. The valley excitons effectively interact with the defects for site-controlled excitation, photoluminescence enhancement and spin-dependent manipulation. Specifically, the spin-dependent branches of photoluminescence in momentum space originate from valley excitons with opposite helicities and evidence the valley separation at room temperature. To further demonstrate the versatility of the Berry-phase defective photonic crystals, we use this concept to separate opposite spin states of quantum dot emission. This spin-enabled manipulation of quantum emitters may enable highly efficient metasurfaces for customized planar sources with spin-polarized directional emission.
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The data that support the plots within this paper and other findings of this study are available from the corresponding author upon reasonable request.
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We acknowledge financial support from the Israel Science Foundation (ISF); the US Air Force Office of Scientific Research (FA9550-18-1-0208) through their programme on Photonic Metamaterials; the Israel Ministry of Science, Technology and Space; the United States–Israel Binational Science Foundation (BSF); and, in part, the Technion via an Aly Kaufman Fellowship. The fabrication was performed at the Micro-Nano Fabrication & Printing Unit (MNF&PU), Technion.
The authors declare no competing interests.
Peer review information Nature Nanotechnology thanks Alexandr Krasnok and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Rong, K., Wang, B., Reuven, A. et al. Photonic Rashba effect from quantum emitters mediated by a Berry-phase defective photonic crystal. Nat. Nanotechnol. 15, 927–933 (2020). https://doi.org/10.1038/s41565-020-0758-6
Nature Nanotechnology (2020)