AI Article Synopsis

  • Researchers are studying single photon emission from localized excitons in 2D materials like WSe monolayers for quantum information applications.
  • By applying deformation strain to specially designed substrates, they can create quasi-1D localized excitons, producing photons with high polarization purity and controllable orientation.
  • At zero magnetic field, these emissions are linearly polarized with 95% purity but can switch to high-purity circular polarization under a strong magnetic field, enhancing their usability in integrated quantum photonics.

Article Abstract

Single photon emission from localized excitons in two-dimensional (2D) materials has been extensively investigated because of its relevance for quantum information applications. Prerequisites are the availability of photons with high purity polarization and controllable polarization orientation that can be integrated with optical cavities. Here, deformation strain along edges of prepatterned square-shaped substrate protrusions is exploited to induce quasi-one-dimensional (1D) localized excitons in WSe monolayers as an elegant way to get photons that fulfill these requirements. At zero magnetic field, the emission is linearly polarized with 95% purity because exciton states are valley hybridized with equal shares of both valleys and predominant emission from excitons with a dipole moment along the elongated direction. In a strong field, one valley is favored and the linear polarization is converted to high-purity circular polarization. This deterministic control over polarization purity and orientation is a valuable asset in the context of integrated quantum photonics.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8431731PMC
http://dx.doi.org/10.1021/acs.nanolett.1c01927DOI Listing

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