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 WSe2 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.
Highlights
Quantum emitters based on WSe2 represent a potentially powerful platform for the exploration of quantum photonics concepts
The linear polarization is attributed to valley hybridization, and this is corroborated by a magnetic fielddependent study
To generate a quasi one-dimensional confinement potential that traps excitons, the WSe2 monolayers are clad over an array of square shaped silicon-oxide pillars, each with a footprint of 1 μm × 1 μm
Summary
The quantum emission of localized excitons serves as an essential building block of quantum optics[1,2] and quantum information technology.[3,4] Excitons localized by atomic defects or by a topography-induced dot-shaped strain potential in. WemSiess2iohnavcehabreaecnterriesptiocsr.t5e−d9 to typically exhibit single photon The emission of two-dimensional (2D) WSe2 can be field,[6,8] and mechanical tuned by electric field,[5] strain[10−18] because it magnetic is both atomically thin and flexible.[19,20] it is straightforward to integrate WSe2 quantum emitters with plasmonic structures[21] and photonic waveguides.[22,23] quantum emitters based on WSe2 represent a potentially powerful platform for the exploration of quantum photonics concepts. We focus on the engineering of the polarization purity and polarization orientation of WSe2 based single photon emitters. Single photon emission comes with high purity linear polarization and the orientation is determined by the geometry of the intentionally imposed strain potential. The linear polarization is attributed to valley hybridization, and this is corroborated by a magnetic fielddependent study
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